Bagon

Bagon is a pokemon in the mystery dungeon series

Red and Blue Rescue Team
Defeat a Bagon, and it could possibly want to join you in Lapis Cave, Wyvern Hill, Joyous Tower, and Wish Cave.

Explores of Time, Darkness, and Sky
Defeat a Bagon that could possibly want to join you in Crystal Crossing.

Gates To Infinity
Defeat a Bagon that could possibly want to join you in Stompstump Forest or Forest Grotto.

Super Mystery Dungeon
Find Bagon as a Traveling Pokemon