One of the fastest way to earn Pokeyen-----Elite 4 rematching
The first step:make an E4 team:
Some players may not have enough money to make a full E4 team at first. so there are some basic ways to earn money at start.
Ditto hunting is a easy job for new player
here is the video about fastest way for ditto hunting which u can sell them about 200k/box
Smeargle @ Silk Scarf
Ability: Technician
EVs: 4 HP / 252 Atk
IVs: 0 HP / 0 Def / 0 Sp