Pokemon and pokeballs
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You can't steal Pokemon however in Pokemon colosseum and Pokemon xd gale of darkness you can snag shadow Pokemon from trainers.
to get data on Pokemon in your pokedex, capture the Pokemon unless they are trainers Pokemon then you have to cheat to get trainers Pokemon.
You need the VS Seeker which is obtained from a girl in the vermilion city Pokemon center.
No
yes grass type trainers do