In Ruby and Sapphire yes you need to beat the Elite Four first, but in Emerald you can catch Raquazza before or after you beat the Elite Four.
You need to beat the elite four before you can get Zekrom.
no beat the elite four first
yes you have to beat the elite four before you can migrate but you must also finish the pokedex so you can get the national pokedex
No.
No you can trade anytime before beating the elite four.
no,that is inposible.
no
No
you cant
No you don't. I caught it after I beat the Elite Four. You can catch it before or after. It doesn't matter.
Yes, you have to beat the Elite Four Champion before you can get Mewtwo, because there is a man standing outside the cave in Cerulean City, blocking the entrance, and he will only disappear if you beat the Elite Four Champion. Since Mewtwo is in the cave in Cerulean City, you have to beat the Elite Four Champion to even get into the cave where Mewtwo resides.
No you must beat the Elite Four first