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, and her seventh overall.
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 Ancient Power, Jessie sent her into battle, who ended up quickly evolving into Yanmega.
Following the Team Rocket trio's journey in Sinnoh, Jessie was forced to leave Yanmega at Team Rocket's headquarters as she is not a Pokémon native in the Unova region and would seem suspicious.
Personality and characteristics
Though not much is known about Yanmega's personality to distinguish her from others of her species, she is shown to have a habit of landing on the heads of people and other Pokémon. She has been shown to land on Jessie, James, and Seviper's heads, and even Ash, Dawn, and Brock's as a Yanma before she was caught by Jessie. Yanmega is shown to be exceptionally powerful compared to the rest of Team Rocket's Pokémon, being the closest of any of them to send Ash and his friends blasting off. In Playing The Leveling Field!, Yanmega is shown to care about Jessie's approval, crying when she couldn't imitate Fantina's Drifblim for Jessie. She is very loyal to her Trainer.