* Leveling up: Most Pokemon evolve when they reach a certain level. The level required for evolution varies from Pokemon to Pokemon. You can check the evolution level for a specific Pokemon by looking it up in the Pokedex.
* Using evolution items: Some Pokemon evolve when they are given a specific evolution item. Evolution items can be found by exploring dungeons, defeating enemies, or talking to NPCs. The evolution item required for a specific Pokemon can be found by looking it up in the Pokedex.
Once a Pokemon has met the requirements for evolution, it will evolve automatically. You do not need to do anything special to trigger an evolution.