You can't get a Mew unless you cheat, I think. A Mewtwo you can only catch in Fire Red\Leaf Green and transfer to your Pearl.
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I don't think you can catch MEW without a action replay. But you can catch MEW2 in Pokemon Fire Red or Leaf Green. You CAN'T cach mew without an action replay, but you can trade mew-two from the other games to the newer ones
pikachu was the first Pokemon to be created along with all the legandarys such as mew, mewtoo, kiogre and groudon
Mew cannot be caught in the wild in Pokemon Diamond and Pearl. You need the action replay code.
there is a mew in Pokemon soulsilver but you need to catch all leadndery Pokemon including event Pokemon
Mew can't be catched in Pokemon heartgold, only mewtwo.