I've been making a Moemon HGSS Patch using your sprites so I thought id give a rundown of the process I have been using to import and convert the sprites.
[spoiler]
First I extract first 3 sprites using nameless sprite editor because it keeps the pallet.
Then using a program called imageJ i Batch convert them to 160x80.
Then using Pokedspic i open and save the new sprite.
Then i use NitroExplorer2b to insert the .narc into the rom.
then just play the rom however you like. [/spoiler]