How do you evolve Charmander in Pokemon mystery dungeon explorers of sky?

In Pokemon Mystery Dungeon: Explorers of Sky, you can evolve Charmander into Charmeleon at level 16 and then into Charizard at level 36.

Keep in mind that you can only evolve Charmander into Charmeleon and then into Charizard if you choose Charmander as your partner at the beginning of the game. If you chose another starter Pokémon, Charmander won't be available for you to evolve.