You find him at level 99 of the Western Cave. You unlock the cave by recruiting Ho-oh. You will have to go through the Western Cave twice to recruit him but the second time you HAVE to fight him alone or else he won't join.
he's in western cave
it's the same as the pokemon mystery dungeon red rescue team. you can find mewtwo in the western cave once you recruited ho-oh.
Mewtwo is on the 99th floor of western cave
99 and at the end is mewtwo
There are tons of keys in that dungeon with Mewtwo in it, or you can always buy 'em(They're 8000 Poke in the Kecleon shop)
No, Pokemon Mystery Dungeon: Red Rescue Team is only for Nintendo Gameboy Advance.
Pokemon: Red Rescue Team is played on the GameBoy Advance. Pokemon: Blue Rescue Team is played on the Nintendo DS. There are many small differences besides this.
Curently, Pokemon Mystery Dungeon: Blue Rescue Team is out and available all around the world.
try Pokemon mystery dungeon red rescue team or blue rescue team
jirachi
Defeat them while you're in their dungeon.
Some Pokemon do, others come with their own areas EG. Mewtwo