Slowbro doesn't evolve. Slowpoke does if you give it a king's rock and trade it.
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Level 37 for Slowbro, trade holding a King's Rock for Slowking.
he doesnt evolve slowbro is his last evolution-----------------------------------------------------------------------------------------------------Catch a slowpoke at slowpoke well if you raise him up to level 37 he will evol Slowbro- however, BEFORE he reaches level 37 if you want a slowking you will have to trade a slowpoke with a king's rock this does not work on slowbro, I fell for this once too- If you want a strong slowpoke go to the bottom of slowpoke well (You need Strength for this) and surf left there you will see a Nerd and he shall give you a king's rock. If you have given your slowpoke lots of cand, vitamins, precious TMs the best thing is to trade it with a kings rock to a friend's DS and back again. If you have lots of badges and you want a quick leveler trade your slowpoke for someone else's slowpoke holding King's Rock. I hope it helps,POKEMONISCOOL
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.
In order to evolve Slowpoke, you can level it up until Level 37 and it will begin to evolve into Slowbro or you can attach the King's Rock item to it and then trade it to another player's game in which case it will evolve into Slowking.
Slowbro does not evolve. To get a Slowking, have a Slowpoke hold a King's Rock. While still holding the item, trade it with a friend and Slowpoke will evolve into a Slowking.