Unfortunately, you cannot nickname traded Pokemon in this game, or any Pokemon game for that matter. You can nickname your own caught Pokemon by going to the Condominiums next to the PokeMart in Eterna City and ask the old man near the entrance. I hope that you will make do!
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No, you can't rename traded Pokémon legitimately, you will have to use a cheating device for it such as an Action Replay. Here is the Action Replay code for it. 5215BE54 2800FB2B 0215BE58 B0022001 0215BE5C 1C388028 D0000000 00000000
Uxie, Mespirit, and Azelf are unavailable in Pokemon SoulSilver. They can, however, be traded from a Diamond, Pearl, or Platinum game, or transferred from a Gen III game.
Slowpoke cannot be caught in Pokemon Diamond. This Pokemon can be found on route 205 in Pokemon Pearl using the pokemon radar and traded to Diamond.
Haunter evolves when traded
Misdreavus is a Ghost type Pokemon available only in Pokemon Pearl (of the fourth generation games). It may be traded over to Pokemon Diamond.