No. How can you catch a Pokemon if you cant weaken it. In Pokemon ranger though you can capture your partner Pokemon.
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You can't catch Darkrai in Pokemon FireRed, it is a 4th generation Pokemon so therefore unavailable in any of the GBA Pokemon games.
You are not allowed to catch other trainer's pokemons on any of the Pokemon games. You may only catch Pokemon from the wild or receive them through other means (events, game corner, eggs, etc.)
well,you basicly can,but not in the oringinal mode.you have to either beat the Pokemon league first or get the national pokedex.either way,you can,but you need to catch it in either Pokemon plantum,firered, or leafgreen,but be aware that if you migrate it to any of your ds Pokemon games then trade it to Pokemon b/w, you cant trade them back.
lucky for you if you go to the first route and talk to the girl there will be a pop up saying 'SHADOW POKEMON CATCH WITH ANY POKEBALL!' and that's a free shadow Pokemon!
You are not allowed to receive or catch any 4th gen Pokemon because they don't exist in the 3rd gen games.