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.
Prof oak after beating the elite four.
I think by beating the Elite Four
after beating the elite four you'd get rainbow pass
After beating the elite 4 he/she randomly appears in the wild so you have to find him/her
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::..
well you have to wait all credits
after beating the elite four, it would be wild in kanto ONLY if u chose squirtle as ur starter pokemon.
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!
u dont need a cheat after u beat them once u can just challenge them for fun!!!
You can go back to Cerulean cave and catch Mewtwo, or simply try to "Catch 'em all"
No its not an HM in leafgreen.