The Pokemon Drowzee evolves into Hypno at level 26. Players can level up Drowzee by either using it in battle, or by synthetically increasing its level by feeding it rare candies at a rate of one level per candy.
Both Drowzee and Hypno are psychic-type Pokemon with similar traits. In certain versions of Pokemon, Hypno can be found in the wild. In other versions, Hypno can only be acquired by evolving Drowzee or by trading. Although players can delay the level at which Drowzee evolves, Hypno has far greater base stats, making the evolution very worthwhile for players looking to maximize the effectiveness of their Pokemon.