Ezrile

What is a swarm ?
In PokeMMO, a swarm is a wild group of Pokemon. It appears at a given place at a given time for a limited time. A swarm is composed of 4 Pokemons that appear in overworld as sprites. Sometimes, Pokemons appear outside their usual location
Official presentation of swarms by PokeMMO.

This is the official presentation from PokeMMO. We can see :
- Top Left : Absol swarm at Lost Cave (Kanto)
- Top Right : Vileplume swarm at Route 230 (Sinnoh)
- Bottom Left : Wailmer swarm in the sea (unknown place)
- Bottom Right : Scyther swarm at Route 14 (Kanto)
 
 
Why is a swarm useful ?
A swarm is an easy way to catch a Pokemon outside its usual location. Somtimes swarm are composed of Pokemon you can't find in the wild.
Pokemon from swarms often have good IV stats.
 
 
Where do swarm appear ?
As far as we know, a swarm can appear in many places :
grass, cave, routes (even without grass), sea, lakes, Power Plant, Pokemon Mansion
We haven't seen any swarm in cities for now.
 
 
What Pokemon ?
We haven't seen enough swarms to have an accurate list of what Pokemon can appear in swarm. But we think there is no limit as the Pokemon is available in the game.
We noticed some kinf of combinations. The pokemon that appear and its locations seem to be linked
Notable appearances : Magnezone (at Power Plant), Dusknoir (at Memorail Pillar), Lapras (in the sea), Chansey...
 
 
When does a swarm appears ?
As far as we know, a swarm can appear at any time of the day or the night.
 
 
How long does it appear ?
We don't know precisely. Between 15 and 40 minutes (IRL Time)
 
 
How to know ?
There are two ways to be aware of a swarm and its location
1/ Come across the swarm in the wild "by chance"
2/ Watch TVs in PNJ House (credits to @Minks)
A TV of a region can tell if there is a swarm and this region. If a there is a swarm in the region. An announcement will replace the advertisements and tell you the place and the Pokemon of the swarm.
 

(sorry, I only have it in French. It says : "BREAKING NEWS! We heard from Yan that wild Lapras have been spotted at Route 125!)
 
 /!\ TV doesn't work in Unova. There is no way to track swarms there... /!\
 
 
Some Questions...
Do swarms appear for everyone ?
Yes.
 
Are IVs the same for everyone ?
No.
 
How many swarms a day ?
We don't know for now
 
Have swarms better shiny rate ?
No. This has been answered by official PokeMMO Facebook page.
 
 
What do we still don't know...
Many things !!! We would like to :
- write a full list of Pokemon from swarms
- write a full list of places where swarms appear
- be able to know if a moment in a day is best to see a swarm appears
 
 
 
How to answer these questions ?
We need data... to conduct some studies. If you spot a swarm and want to share this precious data with us, you can report it by following this link and answer this quick Google form :
https://forms.gle/d5ZiF9wzxer5LtpUA
 
We don't ask you for personal data and we will never ask for it. If you want, you can share you nickname so we can credit your report.
 
 
Known combinations so far
 
 
Your help is welcome ! Please pardon my english. Do not hesitate to correct if needed.
If you have questions. Feel free to ask. This will complete the guide.
 
A lucky swarm !

 
 
Thanks to @Dip for typo corrections
 

2024 Horde Locations
 
 Basculins Tentacrools Peligulls
 
Source: The in-game Pokedex
 
Shiny Hunting 
 
EV Locations 
 
Winter Hordes - April, August, December
 
Ctrl + F to search
 
 
 
Specifications:
Water
Cave
Dark grass
  Exact location
Underlined = 100% Encounter
 
(Night) 21:00 - 04:00
(Morning) 04:00 - 11:00
(Winter) = April - August - December   
 
 
Hoenn
 
Unova
 
Sinnoh
 
Johto
 
 
 
 
Kanto
 
Ctrl + F to search
Route 4  x3
 
Rattata
Spearow
Goldeen x5
 

Route 5  x3
 
Meowth
Mankey
 
 
Route 6  x3
 
Magnemite
Drowzee (Night)
Psyduck x5
Slowpoke x5
 
 
Route 7  x3
 
Rattata
Vulpix (Morning)
Growlithe (Day)
Houndour (Night)
 
 
Route 8  x3
 
Pidgey (Day)
Vulpix (Night/Morning)
Growlithe (Day/Morning)
Hoothoot (Night)
 

Route 9  x3
 
Rattata
Spearow
 
 
Route 10  x3
 
Magnemite
Voltorb
Goldeen x5
 
 
Route 11  x3
 
Drowzee
 
 
Route 12  x3
 
Krabby
Pidgey
Venonat(Night)
Slowpoke x5
 
 
Route 13  x3
 
Bellsprout
Oddish (Night)
 
 
Route 14  x5
 
Nidorina  10HP 
 
 
Route 15  x5
 
Nidorino  10ATK 
 
 
Route 16  x5
 
Raticate
Grimer
 

Route 17  x5
 
Raticate
Fearow (Day/Morning)
 
 
Route 18  x5
 
Raticate 
Doduo (Day/Morning)
Grimer (Night)

 
Route 19  x5
 
Tentacool
 
 
Route 20  x5
 
Tentacool
Tentacruel
 
 
Route 21  x5
 
Tangela
 
 
Route 22  x5
 
Poliwhirl  10SPEED 
 
 
Route 23  x5
 
Arbok  10ATK 
Primeape  10ATK 
Psyduck
Slowpoke
 
 
Route 24  x3
 
Pidgey
Venonat (Night)
Goldeen x5
 

Route 25  x3
 
Bellsprout
Oddish (Night)
Seaking x5  10ATK 
 
 
Berry Forest  x5 
Hypno  10SDEF 
Golduck
Slowbro
 
 
Bond Bridge  x5 
 
Gloom  10SATK 
 
 
Canyon Entrance  x5 
 
Fearow 
Phanpy
Persian (Night)
 
 

Cape Brink  x5 
 
Slowbro  10DEF 
Golduck  10SATK 
 

Celadon City  x5 
Grimer
 
 
Cerulean Cave  x5 
 
Wobbuffet F1  10HP 
Lickitung F1  10HP   
Golduck F1  10SATK 
Parasect F2 10ATK 
Kadabra B1  10SATK 
Slowbro B1  10DEF 
 
 
Cerulean City  x5 
 
Goldeen
 
 
Diglett's Cave  x3 
 
Diglett
 
 
Five Island  x5 
 
Hoppip
 
 
Five Isle Meadow  x5 
 
Pidgeotto  10SPEED 
Hoppip (Day/Morning)
 

Four Island  x5 
 
Wooper
 
 
Fuchsia City  x5 
 
Psyduck
Slowpoke
 
 
Icefall Cave  x5 
Dewgong R1 10SDEF  
Seel R1 Back Cave  
Golbat R2  10SPEED 
Piloswine B1 5HP 5ATK  
 
 
Kindle Road  x5 
 
Meowth
Ponyta
 
 
Lost Cave  x5 
Haunter B1 
Golbat B1 
Murkrow B1 (Right > Down)(Night) 
Misdreavus B1 (Right > Down)(Night)  *SKILL SWAP
 
 
 
Memorial Pillar  x5
 
Skiploom  10SPEED 
Hoppip
 
 
Mt. Ember  x5
 
Rapidash Outside  10SPEED 
Machop F1 
Machoke F2 B1 10ATK 
Geodude F3 B2
Slugma B3 
Magcargo B4  10DEF 
 
 
 
Mt. Moon  x3
 
Zubat F1
Geodude F1 B2
Paras B1
 
 
 
Pattern Bush  x5
 
Kakuna  10DEF 
Metapod  10DEF 

 
Pokémon Mansion  x5
 
Koffing F1 
Grimer F1 
Rattata F2 
Ponyta F2 F3
Vulpix F3 (Night/Morning) 
Growlithe F3 (Day/Morning)
Raticate B1
Ditto B1 
 

Pokémon Tower  x3
 
Gastly
Zubat 
Golbat
Haunter
Cubone 
 
 
Power Plant x5
 
Pikachu  10SPEED 
 
 
Resort Gorgeous  x5
 
Hoppip 
 
 
Rock Tunnel  x3
 
Zubat
Geodude
Onix
 
 
Ruin Valley  x5
 
Fearow  10SPEED 
Marill  10HP 
 
 
Seafoam Islands  x5
 
Psyduck F1 
Slowpoke F1 B1 
Seel B1 B2 B3 
Krabby B3 
Kingler B4  10ATK 
 
 
Sevault Canyon  x5
 
Marowak  10DEF 
 
 
Three Isle Port  x5
 
Dunsparce  
 
 
Treasure Beach  x5 
 
Persian
Tangela
 
 
Victory Road  x5
 
Machoke F1  10ATK 
Rhydon F1  10ATK
Marowak F2 10DEF 
Sandslash F2  10DEF
Onix F3 
Donphan F3
Ursaring F3  (Winter)
 
 
Viridian City  x5
 
Poliwag
 
 
Water Labyrinth  x5
 
Hoppip
 
 
Water Path  x5
 
Persian  10SPEED 
 
 
 

Introduction:
Hello everyone,i am BlueNose from china .I  have been running a website about pokemmo since 2019.12.17,in  more than a year, there are more and more functions in my website,since its a bit difficult for me to internationalize the entire website, i select some simple,clear ,useful functions which i remake into english and be glad to introduce it to you.I rent a cloud server and its put in ShangHai China,I hope there is less or no delay while you are using it.
 
Website URL:
https://www.pokemmotoolbox.com/home
 
Function Index:
Eggmove Search(support both in Chinese and English)  https://www.pokemmotoolbox.com/english/eggmove/search Dress Room(support both in Chinese and English)  https://www.pokemmotoolbox.com/english/cosmetic/dress-room IV Rate Calc(support only in Chinese) https://www.pokemmotoolbox.com/breed/rate Breeding Cost Calc(support only in Chinese) https://www.pokemmotoolbox.com/breed/cost Berry Profit Calc(support only in Chinese) https://www.pokemmotoolbox.com/berry/profit Capture Rate Calc(support only in Chinese) https://www.pokemmotoolbox.com/capture Team Config & Harm Calc(support only in Chinese) https://www.pokemmotoolbox.com/team/config https://www.pokemmotoolbox.com/pokemon/harm  
 
 
 
 
 
 
 
 
 
 
 

Values over time:
 
So i decided to make a guide where i list vanities and other stuff worth to invest in and their lowest price in gtl at a certain date. Im aware that GTL prices dont always reflect real values, but i guess its a reliable way to see trends and developments over time. This is mainly meant for players who want to start to invest and are unsure which things usually do well. I start with the stuff i own myself mostly since i keep track of those anyways, will add other stuff tho once they are requested. I will update this around every 2 weeks.
 
2021:
 
2022:
*red or green numbers are always compared to the last time i checked
 
 

This guide is written in English
CLICK HERE (<- Español y/o Portugues).
中文翻译 (Chinese translation)
 

 
Hello PokeMMO Shiny Hunter \o/

I have been considering writing a shiny hunting guide for a while as there is no detailed one out there.
In addition, I thought it would be the perfect time to create a shiny hunting guide due to my blessed RNG in 2020 (link).
 
 
 
What will you gain and learn from reading this guide?
Firstly, this guide will contain a shiny hunt introduction that will provide you with basic knowledge about the PokeMMO shiny rates and possible modifications that can increase your odds of finding a shiny. In addition, I will also introduce you to the use of Sweet Scent and the nerdy aspect of binomial distribution calculation of shiny hunting.
Secondly, I have added a short section about the most common methods  in the aspect of PokeMMO shiny hunting (horde hunting, single encounters, egg hatching and hunting in the Safari Zone).
Furthermore, I have added a short section about helpful shiny hunting tools that can benefit you throughout your hunt, including an Encounter Counter and a HD Sprite shiny mod.
Lastly (for now), a section with useful website links and guides that are useful or interesting for your shiny hunting.
In summary, I will humbly teach you all about shiny hunting in PokeMMO. 
 
Are you looking for inspiration about what to hunt?
If you are looking for ideas about what to hunt, I recommend looking in one of my best Pokébud's detailed 2020 All Horde Locations - EV and Shiny guide. You can find every horde location in that guide - and it can provide you with interesting and alternative EV training spots if you feel like avoiding that shiny Tentacruel. 
 
 


 
 
As an introduction, Shiny Pokémon can be met anywhere in the wild (or from eggs). Known methods from the original games such as Mesuda and chain fishing are NOT implemented in PokeMMO, and thus you will have to settle with the set shiny rate in PokeMMO. 
 
In fact, we all know that the shiny rate in PokeMMO is 1/30000, which can be modified to 1/27000 with Donator Status or approximately 1/24300 with Donator Status +  Shiny Charm (+10%) and so on:
In summary, this means that you, for each encounter/hatch of one Pokémon, will have a chance of either 1/30000, 1/28500, 1/27000, 1/25650 or 1/24300 to encounter/hatch a shiny depending on the active modification of your account (see above-shown Spoiler section). This includes all sort of encounters, including wild encounters,  egg hatching, swarm encounter and fossil reviving etc.
 
In addition, it is NOT possible to breed non shiny Pokémon with a Shiny Pokémon:
 
Important to remember: There is no stacking of encounters in PokeMMO
The system doesn't track your encounters. This means that even if you are at your FIRST encounter or your 123456th encounter, the chance is still either 1/30000, 1/27000 etc. If you want your shiny, you have to be dedicated and patient. Whenever a shiny Pokémon appears it will appear with its alternative color, a sparkle and with "Shiny" in front of its name:
 
 
Interested in more nerdiness about shiny hunting?
If we are looking at the above-mentioned in addition to considering a binomial distribution, you can roughly estimate your shiny percentage chance (X = %) based on your encounter amount (Y): 
 
 
The best way to increase your chances of finding a Shiny Pokémon:
The best (and fastest) way to increase your chances in regards of shiny hunting is using the Sweet Scent move () to encounter hordes. Sweet Scent can be used almost anywhere (grass, water, ground etc.) to bring forward a horde of Pokémon (2x, 3x or even 5x Pokémon at the same time). In fact, when you encounter a Pokémon horde, each of the (2x, 3x or 5x) encountered Pokémon will have their own chance to be shiny (1/30000 per Pokémon). In theory (based on a binomial considerations), this means that when you encounter a horde of either 2x Pokémon, 3x Pokémon or 5x Pokémon, your chances would be increased to approximately (~) 2/30000 equal to ~1/15000 (2x horde), ~3/30000 equal to 1/10000 (3x horde) or approximately ~5/30000 equal to ~1/6000 (5x horde) that one of the Pokémon will be shiny. You can see Desu (PokeMMO Developer) comment about it here. Another fact in the aspect of Pokémon hordes is the fact that there are no limitations as to the amount of shinies per horde (example).
 
In 2016, Desu also stated some interesting facts (in a post) in regards of shiny hunting that are interesting to know for any shiny hunter:
 
 Secret Shiny Pokémon has been introduced to PokeMMO! 
 
In the update Changelog: 08/06/2022: PokeMMO's 10th Anniversary, Part 1 (link), a new species of Shiny Pokémon was introduced: Secret Shiny Pokémon  
@DamianTe has already written a nice summary of the new feature, which I have decided to include in this guide (open spoiler section): 
 
 
 

 
When it comes to shiny hunting, there are a number of methods that you can use, including 1) encountering Pokémon hordes using Sweet Scent (move), 2) single encounters, 3)  egg hatching and 4) in the Safari Zone:
 
1) Shiny Hunting via hordes (best and fastest method)
As a matter of fact, hunting shiny Pokémon via hordes is the best and fastest method as mentioned before:
 
2) Shiny Hunting via single encounters (for rares)
Title says it. You basically hunt single encounters and hope you hit jackpot with the set shiny rate:
 
3)  Shiny Hunting via egg hatching  (for rares and elimination of the risk to encounter a common shiny)
Egg hatching is the go-to method if you want to hunt rare Starter Pokémon, Fossil Pokémon or other rares without risking the possibility of encountering a common Shiny Pokémon in the progress of your hunt:
 
4) Shiny Hunting in Safari Zone
 
 

 
This section will contain legal shiny hunting tools that can be of use to you for your hunts. Anything posted here are in compliance with PokeMMO's Code of Conduct. 

1) The best way to keep track of your number of encounters:
@Fixedgaming is one of our very best tool developer. He has developed a very solid Encounter Counter that keeps track of your hunt. I am sharing this, as I believe that knowing your encounter amount is what is the most important motivational factor when shiny hunting. As an alternative to this tool, you can just count your  Leppa berries.
 
@Gilan is also one of our very best tool developer, and he has created the newest encounter counter, which I believe most of the community is currently using for their shiny hunts: [TOOL] Gilan's Encounter Counter
 
2) HD Battle Sprites to distinguish shinies from nonshinies:
@Verdep posted a very nice HD Battle Sprite mod that can be very important to use whenever hunting shiny Pokémon that looks a lot like their normal form. Installing the shiny package will help you not mistakenly fleeing from a horde containing a shiny. See an example of the visual here:
 
 
 
 

 
This section will contain information about other useful guides or links. If you ever have any suggestions regarding additions, please feel free to let me know. 
 
1) Shiny Existence Thread: https://forums.pokemmo.eu/index.php?/topic/55862-unofficial-shiny-existence-thread-5th-life 
 
2) Find inspiration for your next shiny Pokémon: https://pokemondb.net/pokedex/shiny
 
3) 2020 All Hordes Locations - EV and Shiny: https://forums.pokemmo.eu/index.php?/topic/108705-2020-all-horde-locations-ev-and-shiny/
 




Note: I might edit this guide from time to time dependent on feedback from the community!
So if you have any suggestions, changes or other interesting things to add - let me know! 

BEST OF LUCK, POKEMMO SHINY HUNTERS!
May RNGesus be with you

TLDR;
 
 

 
Seth

 

 
 

--------------------------------------
 
   - Welcome to my Farming Guide. As you read on, you will learn (hopefully) the steps to be a farmer. Saffron Mart does not supply berries for you anymore and instead have to plant them yourself or buy them in GTL.
                                     Table of Contents
                                                                         Farming (From Updates Notes)
                                                                            
                                                       
                                        Extra Info
Running out of berries? You can find some berries in Island 3, Berry Forest.  You can also use a Meowth to pickup random items.
- Community Pickup Guide
- Dark patches in Berry Forest are berries.
 
- Alt runs can also get you some berries. (First berry you encounter is Oran Berry )
- All over Kanto region, there are dark patches in most of the routes that are berries you can pick up. (Check down below for the locations)
- Kanto Berry Locations
- Kanto Berry Locations Prt 2
- Berry Exchange
 
 
                                      Requirements
 
             -Must have two of the following items: Wailer Pail & Harvesting Tool
            - Both of these items may be found in the house in Route 104. ( $250 for Harvesting Tool. Wailmer Pail is free, given by NPC).        
Harvesting Tool Location
 
Pretty Petal Flower Shop
 
Wailmer Pail - Talk to NPC with Yellow hair.
 
                                   Getting Started
- Using your Harvesting Tool item, You may get seeds from berries you have. Now remember, This item is a consumable so make  sure you buy multiple.
 
1) In your bag, find the item and click on it. After that you will find another menu  ( Select use of course)
 
 
2) Select a berry to harvest and how many you want.   (After harvest you will get some seeds) [ Updated with new pic, includes new layout ]
 
 
 
 
3) Once you have Seeds, You may start to plant a certain combination of them, there are different combinations of seeds to get a certain berry. For instance, the one below is  Very Spicy combined with a Very Sweet and Very Sour, creating a Sitrus berry. It also has a bar showing how much water it has. [ Updated with new pic ]
 
 
 
4) After planting, make sure to water the plants with Wailmer Pail. (Keep at mostly wet/moist) and wait. [ Wailmer Pail allows you to skip all the text you have to read, just put on hotkey and easier shortcut ]
 
 
5) Over time, your plants will start to grow. From seeds, to Saplings, and to a tree. You will know when you can pick berries. Just simply go up to it and press Z... (Should say the amount of berries you will receive.)
 
 
                                   Breakdown Chart
 
  -These Berries will be harvested into these type of Seeds-
 
                                     Combinations
 
- Hovering over the Berries show the combos of it and its production time. [ In-Game ]
- Bold ones indicate they are useful for many things (Tournaments mostly, etc).
- Also includes Spanish translations of berries down below. 
- Blue indicates the new additions of Berries from the Unova Update-
 
 
                                          Duration
 
                                          Watering
 
                                            Death
 
                                          Amounts
 
                                     Seed Info
 
                                          Locations
This will show all the places you can plant your berries.
Route 104 - 11 Plants in total
 
 
Route 120 -  10 Plants in total
 
 
 
 
Route 123 -  12 Plants in total
 
 
 
Mistralton City - 72 Plants
 
 
 
Abundant Shrine - 84 Plants
 
 
                                           Credits
 
- Want to thank everyone  that helped make this guide possible.
 
 
 

Hello everyone, today I come to bring this topic completely updated to 06/25/2021. It belongs to a colleague from China and all credits go to this person. (I don't have a nickname to name). Thanks to @budadeth for helping me with the background! Enjoy it.
 
Update 06/25/2021: 
- Its corresponding background was added.
- Updated particles. (Zodiac)
 
》》Download link. 《《
 
    Screenshots     
 
 
 

This is a guide to make your username and password autofill on the login screen of PokeMMO.
According to user "Strajf" this works on both the Mac and Linux versions of the game.
All credit for the method goes to Desu.
Before Beginning: Locating your PokeMMO config folder
Step 1:
Open Notepad
Step 2:
Copy the following into a new notepad document:


client.ui.login.username=
client.ui.login.password=
[/CODE]
Step 3:
Fill in the top line with your Login name
Fill in the bottom line with your password
Step 4:
Click File, Save as
Name it thing.properties
Save as type "all files"
Make sure it goes in your config folder (Refer to the top of the page)
And now, next time you open PokeMMO it should automatically fill in your user information.

Here's a part of the list of items which are now hold-able and where to find them. Also, Tradeable items from Ruby/Sapphire/Emerald are not mentioned here.

Format is :

Item - Effect - Where to find the said item.


Amulet Coin - Doubles monetary earnings from battles - Route 16 (40 Pokemon in Pokedex required)

Black Belt - Boosts Fighting-type attacks - Cant obtain in game.

Blackglasses - Boosts Dark-type attacks by 10% - Team Rocket Hideout, The floor on which Giovanni is.
 
Blue Shard - Used to buy move tutor moves from the NPC on Island 6 - Wild Qwilfish

Charcoal - Boosts Fire-type attacks by 10% - Celadon City Game Corner. 
 
Choice Band - Held Battle item, boosts attack by 50% - Trainer Tower (bought with battle points)

Cleanse Tag - Reduces wild Pokemon encounter rates. (Function not implemented) - Pokemon Tower (The person beside the healing squares.)

Deepseascale - Doubles Clamperl's Special Defense; Evolves Clamperl into Gorebyss when traded from RSE - Cant obtain in game

Deepseatooth - Doubles Clamperl's Special Attack. Evolves Clamperl into Huntail when traded from RSE. - Cant obtain in game 

Dragon Fang - Boosts Dragon-type attacks by 10%. - Wild Dragonair.

Dragon Scale - Evolves Seadra when traded - Wild Dratini.

Everstone - Prevents evolution. - Route 10 (Rock Tunnel Pokemon Center, 20 Pokemon in Pokedex required)

Exp Share - Pokemon holding this receives half of the earned EXP even if it is not sent into battle - Route 15 (50 Pokemon in Pokedex required)

Focus Band - Sometimes prevents fainting from a KO move. - Wild Machoke
 
Green Shard - Used to buy move tutor moves from the NPC on Island 5 - Wild Relicanth
 
Hard Stone - Boosts Rock-type attacks by 10% - Wild Graveler/Onix

King's Rock - May cause additional flinching when held by attacking pokemon - Wild Poliwhirl and Seavault Canyon Island 7

Lax Incense - Reduces the opponent's accuracy; Use it to breed for Wynaut - Lost Cave 

Leftovers - Recovers 1/16th HP each turn - Route 12 and Route 16 (Wherever Snorlax was sleeping/blocking your path - Use Itemfinder ON the spot where Snorlax once was.)

Lucky Egg - Increases the amount of experience earned by the pokemon holding it by 50% - Wild Chansey

Lucky Punch - Raises Chansey's Critical Hit Ratio - Sevault Canyon 

Macho Brace - Doubles Effort Points earned, but lowers speed to half. - Viridian Gym (Giovanni's spot - Use Itemfinder)

Magnet - Boosts Electric-type attacks by 10% - Wild Magneton

Metal Coat - Boosts Steel-type attacks by 10% - Wild Magnemite.

Metal Powder - Raises Ditto's Defense (And attack, correct me if wrong.) - Wild Ditto

Miracle Seed - Boosts Grass-type attacks by 10% - Celadon City Game Corner 

Mystic Water - Boosts Water-type attacks by 10% - Celadon City Game Corner 

Nevermeltice - Boosts Ice-type by 10% attacks - Wild Dewgong (Thanks Tenebris!)

Poison Barb - Boosts Poison-type attacks by 10% - Wild Arbok

Quick Claw - Pokemon holding it may attack first - Safari Zone
 
Red Shard - Used to buy move tutor moves from the NPC on Island 7 - Wild Corsola

Sea Incense - Boosts Water-type attacks - Lost Cave 

Sharp Beak - Boosts Flying-type attacks by 10% - Wild Fearow

Silk Scarf - Boosts Normal-type attacks - Lost Cave 

Silverpowder - Boosts Bug-type attacks by 10% - Wild Venomoth

Smoke Ball - Flee from a wild Pokemon without fail. - Celadon Game Corner 

Soft Sand - Boosts Ground-type attacks - Wild Sandslash

Soothe Bell - A pokemon's happiness rises faster. - Pokemon Tower (Mr. Fuji's spot - Use Itemfinder)

Spell Tag - Boosts Ghost-type attacks by 10% - Wild Haunter 
 
Stick - Raises Farfetch'd's Critical Hit ratio - Vermilion City (Trade Farfetch'd)

Thick Club - Doubles Cubone and Marowak's Attack - Wild Cubone and Marowak

Twisted Spoon - Boosts Psychic-type attacks by 10% - Wild Abra and Kadabra

Yellow Flute - Cures confusion when played - Celadon City Game Corner 
 
Yellow Shard - Used to buy move tutor moves from the NPC on Island 1 - Wild Chinchou

Key Items List :

Bike - Allows you to move around the world faster - Exchange with a Bike Voucher at Cerulean City Bike Shop

Bike Voucher - Exchange for a Bike - Obtain from Chairman of Vermilion City Pokemon Fan Club

Card Key - Unlocks all doors at Silph Co. - Silph Co. 5th Floor

Coin Case - Holds 9999 Casino coins - Celadon City Cafe

Dome Fossil - Resurrect to become Kabuto - Mt. Moon (Fossil on the left.)

Gold Teeth - Belongs to the Fuchsia Safari Warden - Safari Zone

Good Rod - Fish for medium-levelled water Pokemon - Fuchsia City, Beside the warden's house

Helix Fossil - Resurrect to become Omanyte - Mt Moon (Fossil on the right.)

Itemfinder - Detects hidden items in close proximity - Route 12 (Need 30 pokemon)

Lift Key - Allows the use of the elevator in Team Rocket's Celadon Hideout - Celadon City Rocket HQ

Meteorite - Trade for a Moon Stone on Island #2 - One Island 

Oak's Parcel - A parcel for Professor Oak - Viridian City Pokemart

Old Amber - Resurrect to become Aerodactyl - Pewter City Museum back entrance

Old Rod - Fish for low-levelled water Pokemon - Vermilion City

Pokeflute - Wakes up sleeping Pokemon - Lavender Town, rescue Mr. Fuji from Pokemon Tower

Rainbow Pass - Allows passage to Islands #4, #5, #6 and #7 - One Island 

Ruby - Needed to repair Celio's Network Machine - One Island Cave 

Sapphire - Needed to repair Celio's Network Machine - Five Island Rocket HQ 

Secret Key - Unlocks Cinnabar Gym - Pokemon Mansion

Silph Scope - Reveals Ghost Pokemon in Pokemon Tower - Celadon City Rocket HQ

SS Ticket - Allows entry to the SS Anne - Bill's House
 
Sun Stone - Evolves Gloom to Bellossom - Ruin Valley Island 6 and a held item for Solrock

Super Rod - Fish for high-levelled water Pokemon - Route 12

Tea - Give to the Saffron Guards to get through the checkposts - Celadon Mansion, A.K.A the mansion where eevee is found.

Town Map - A map of the Kanto and Rainbow Islands Region - Daisy in Pallet Town, beside your own house

Tri Pass - Allows passage to Islands #1, #2 and #3 - Three Island 

VS Seeker - Detects trainers wishing to battle - Woman inside Vermilion City Pokemon Center.