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It isn't meant for any one pokemon. Most people use it on Mewtwo, which you probably should use it on. You can catch the legendary birds and Mewtwo without a Masterball but it can take a long time.
the masterball is for any Pokemon you want, it can catch them without fail ( it will ALLWAYS work ) . you are supposed to use it for mewtwo though. :P
Mewtwo.
Mewtwo!
it is mew and mewtwo with a masterball
the strongest pokeball is the masterball. the masterball can catch any Pokemon out of the 493. it doesnt matter what kind of Pokemon it is, the masterball can catch any Pokemon.
Mewtwo is found in cerulean cave.
no, firered or leafgreen
Try to catch it with a masterball. that's what i did.
Mewtwo, yes, if you have a FireRed or LeafGreen with Mewtwo.
you have to save your masterball no matter what and use it on mewtwo in order to catch it faster. otherwise, you are going to spend hours trying to catch it without any luck.
Catch 'em all