You can go back to Cerulean cave and catch Mewtwo, or simply try to "Catch 'em all"
Prof oak after beating the elite four.
I think by beating the Elite Four
after beating the elite four you'd get rainbow pass
yes but first you need to get the national pokedex from oak after beating the elite four.
you breed them on four islands after beating the elite four but you need a boy and a girl or any gender and a diddo answered by ..::Seth::..
No its not an HM in leafgreen.
after beating the elite four, it would be wild in kanto ONLY if u chose squirtle as ur starter pokemon.
in what game of Pokemon
well you have to wait all credits
Yes, you must Pal Park the Pokemon you want onto Pokemon Pearl. You can only Pal Park after beating the Elite Four though. Hope this helped!
FAP
There is no code to specifically beat the elite four, but there are some codes that makes it easier. As most of them specialize in one type in particular, they usually have a common weakness amongst their Pokemon.