Jessie's Yanmega (Japanese: ムサシのメガヤンマMusashi's Megayanma) is the only Pokémon caught by Jessie of Team Rocket during her travels through Sinnoh.
As a Yanma
Jessie caught Yanmega as a Yanma in The Thief That Keeps On Thieving! after Tylerbattled and weakened her. After she captured her, Yanma was sent to Giovanni as their second successful theft. However, he immediately returned her after analyzing her and realizing she wasn't good enough, along with the fact that they already had plenty. Jessie then decided to train Yanma herself—unbeknown to the fact that Yanma already knew AncientPower, Jessie sent her into battle, who ended up quickly evolving into Yanmega.
In Pursuing a Lofty Goal!, James borrowed Yanmega in order to enter into a PokéRinger competition. Jessie was reluctant as James failed to win the competition with her Dustox before. Like before, James failed to win with Yanmega.