How do you evolve Slowpoke into Slowbro?

Level it up to 37 or higher. Use a Galarica Cuff, Galarian Slowpoke only, into Galarian Slowbro.

How do you evolve Slowpoke into Slowking?

Trade it while it holds a King's Rock. Use a Galarica Wreath, Galarian Slowpoke only, into Galarian Slowking.

waterpsychic#079 · 2 evolutions

Slowpoke has 2 evolutions: Slowbro (level it up to 37 or higher) and Slowking (trade it while it holds a King's Rock).

Slowbrowaterpsychic

Slowkingwaterpsychic

More than one line means the method differs by game or by form; any one of them works where it applies.