Slowbro evolves into slowking when you trade it while it's holding a King's Rock.
level 37Evolves into a Slowbro at lvl.37Level 37.
level 37
Go to the safari zone when you are able to customize the safari zone and go to the rocky beach and go through the grass until you find slowbro. OR, you could catch a slowpoke at the rocky beach and go through the grass and evolve it at level 24. I hope I haved helped.
you have to trade it to evolve.
Slowpoke evolves into slowbro at level 37
In Pokémon LeafGreen, Magnemite will evolve into Magneton at Level 30.
at level 40
level 28
Level 31.
Level 38.
level 26
at level 36