how to evolve slowpoke into slowbro

To evolve Slowpoke into Slowbro in the mainline Pokémon games, you simply need to level it up until it reaches level 37; at that point it can evolve into Slowbro.

Here are quick notes for different versions and variants:

• In most core games (from Gen 1 onward where both exist), a regular Slowpoke evolves into Slowbro starting at level 37.

• The same Slowpoke can instead become Slowking if it is traded while holding a King’s Rock, in games where Slowking is available.

• In regions with Galarian Slowpoke , that form does not evolve into classic Slowbro by level; instead it uses special items (Galarica Cuff for Galarian Slowbro, Galarica Wreath for Galarian Slowking), so check that you’re using a regular Kanto Slowpoke if you specifically want standard Slowbro.

Mini story flavor: In the Pokédex lore, Slowpoke becomes Slowbro when a Shellder bites onto its tail, which is why its evolution level is tied to growing stronger and more “distracting” in battle until that fateful moment.

TL;DR: Use a normal Slowpoke, train it to level 37, then trigger evolution to get Slowbro.

Information gathered from public forums or data available on the internet and portrayed here.