the most powerfull Pokemon is mewtwo but people think its areceus when its not on Pokemon explores of time it is darkrai on darkness it is mewtwo on platinum it is mewtwo on dimond it is mewtwo on pearl it is mewtwo on blue rescue team it is mewtwo on red rescue team it is mewtwo on chores black it is mewtwo on ruby it is once again mewtwo i could go on for ever but i am trieng to make my point :)
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darkrai and arcus
spiritomb, because it has no weaknesses
By far, they have said Celebi is the hardest/rarest Pokemon to obtain outside of Japan.
Not including the legendaries and special pokemon ( ones that you can only catch once ) feebas is the hardest and rarest pokemon to catch
Beat the pokemon league but they are the hardest to beat in the hole game hope I helpd