You collect all eight badges, and then you challenge and beat the Elite Four.
Mr. Fuji gives it to you after you beat Team Rocket in Pokemon Tower.
ya u can trade Pokemon in blue before u beat the elite four.
you have to finish the team rocket part in Silph co. and beat Giovanni.
To beat the Pokemon Leaf Green version for Gameboy you have to get the Nation Dex and beat Raiku and Suicune.
um u finish the game and that's it And not a lot happens, you can still play, collect more Pokemon train, beat elite four again........quite boring after that
Syther is not available in Blue version and must be transferred from Red version.
Finish your Pokedex And Beat The Elite Four once then the second time they have stronger Pokemon
no
not possible
you fill your pokedex
Actually, there is such a thing as Pokemon Blue Sea version. It's a hack and it pretty much all in Spanish. As for what to do after you beat Whitney, I have absolutely no idea! I just found this version today and got to where you are and am stuck as well... I can't find cut, though it would probably help if I spoke Spanish. Good luck
the Pokemon have levels not you