Slowpoke into Slowbro: Level 37
Slowpoke into Slowking: Trade with King's Rock attached.
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Slowpoke will evolve at Level 37.
Oh, dude, Slowpoke evolves into Slowbro starting at level 37 in Pokemon Soul Silver. So, like, if you want that dope Water/Psychic type on your team, just keep grinding and eventually Slowpoke will evolve into a Slowbro. Just don't rush it, man, let the evolution happen naturally.
Slowpoke evolves into slowbro at level 37
level 37
Have your Slowpoke hold a King's Rock, then trade it with a friend to get a Slowking.