To get slowpoke to evolve in any Pokemon game you must do the following:
If you want him to evolve in to a Slowbro Just simply level it up
Unless you want a slow king you must do these steps:
1. Obtain a King's Rock
2. Make Slowpoke hold the King's Rock
3. Finally Level up slowpoke while their holding the King's Rock
*Please Note: Once Slowpoke has evolved into a Slowbro you cant evolve them into a Slowking
lv 37 or trade it with a kings rock
I It evolves into a slobro at Lv 37 and sliming when traded holding a king's rock
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Have your Slowpoke hold a King's Rock, then trade it with a friend to get a Slowking.
I think you have to level it up to Level: 34 hope this helps
Slowpoke will evolve at Level 37.
You can catch it in Slowpoke Well. That's the only location I can remember.
Slowpoke into Slowbro: Level 37 Slowpoke into Slowking: Trade with King's Rock attached.