Why yes they do!
No because they are two different games and because the codes are different
You will need a Action Replay(or it might be Gameshark) and you can find codes on Google.
Hey I Used Pokemon Firered Codes just use Pokemon firered gameshark codes
In Pokemon firered and leafgreen mew is not in wild , only event or you can use gameshark codes or YOU CAN HACK THE GAME !! THIS is even for AAALLL POKEMON GAMES only event or hack or gameshark
for Pokemon there are no codes
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No, they do not.
yes.you have to have gone to the event.personally,i use cheat codes
you cannot catch celebi in Pokemon leafgreen. you can only get it through cheat codes or trading.
The only legitimate way to obtain Celebi and Mew is through a Nintendo event. In FireRed and LeafGreen you will need an event-only item to travel to the last two islands where you can catch those Pokemon
use that gameshark user.
you find codes at neoseeker