You can't steal Pokemon however in Pokemon colosseum and Pokemon xd gale of darkness you can snag shadow Pokemon from trainers.
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This is the code for "Catch Trainers Pokemon" B6C5368A 08BE8FF4 B8D95CFE 06ED6EA1 E151C402 8A229A83 8E883EFF 92E9660D Press L+R in battle to be able to catch trainers pokemons as if they were wild.
no
you can't
battle trainers or catch the Pokemon
i don't know but sertch on Pokemon cheats.com