This depends. What Pokemon are you trying to defeat? Try to get all legendary Pokemon.
beat the Pokemon league
you need to beat the E4
No its not an HM in leafgreen.
Catch all the Pokemon. credits are rolled if you beat the Pokemon league
The best way to trade i guess wuld be to 'MIGRATE' from LeafGreen, in Pal Park to do this you need to beat the elite four and get the national pokedex
read the question, "where is the 7th gym leader?" everything you need to know will be in there
Any Pokemon really, you just need a good strategy. Watch out for Pokemon type advantages though.
You will only need to beat it if you want to transfer pokemon from the games Ruby, Sapphire, Emerald, Pokemon Colosseum and Pokemon XD Gale of Darkness. You can transfer pokemon immediately to another leafgreen or a firered version using either the GBA link cable or the Wireless Adapters.
Whatever you want.
go sell it at gamestop
nnnnnnnnnnnnnnoooooooooooooooooooooooooo
You would basically need to know about Pokemon to take the quiz then just use mainly water type Pokemon.