Use the gravelerocks, they do a set 20 damage. Or use hunger seed/diet ribbons to make Abra useless. If you can recruit them they are unbelievably strong, though you will need to use some TM's to give them offensive moves.
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Mewtwo lives in cryptic cave, you can get Cryptic cave from wigglytuff in the Pokemon square.
you have to have cut and a certain Pokemon Abra then go to vermillion city and go through diggletts cave and find a house and a man will trade you mr.mime for your Abra
Unknown Dungeon was the name of a cave in Red, Blue and Yellow version that is located northwest of Cerulean City you would need Surf to reach their the cave is now called Cerulean Cave.
A dungeon is a cave on pokemon mystery dungeon. It is a level with a series of floors/rooms and the object is to get to the end of the dungeon.
In solar cave