Slowpoke evolves into Slowbro once it has reached level 37. Slowpoke can also evolve into Slowking if it is holding the King's Rock during a trade. Once it is a Slowbro, it cannot evolve into a Slowking.
- Decide between Slowbro and Slowking
The player needs to choose between leveling Slowpoke to 37 or trade evolving it.
- Get the King's Rock
If evolving Slowpoke into Slowking, the player needs to find a King's Rock to give to Slowpoke. A King's Rock can be found in the Slowpoke Well, Celestic Town, Lumiose City and Mossdeep City.
- Trade Slowpoke
Slowpoke automatically evolves if it is traded while holding the King's Rock.