Chomper

Chomper (チョンパー, Chonpā) is a Pokémon Ryan caught in the region and has been his main Pokémon ever since.

As a wild Pokémon
Garchomp debuted as a in  on. Gible was caught as part of Ryan's strategy of capturing a new Pokémon to challenge his rival, Sara. He was subsequently named "Chomper."

With Ryan
Chomper quickly evolved to Gabite and Garchomp during Ryan's preparation for one of his many rematches with Sara. After locating a, Chomper was able to achieve Mega Evolution, marking the completion of his training. The -type Pokémon battled Sara's own newest member, a Gardeviour named "Vivi," also capable of Mega Evolving. From then on, Chomper and Vivi became their trainers' main battling partners and the two Pokémon became close rivals themselves. Both have had victories and losses against one another.

Departing Kalos for a vacation in Hoenn, Chomper played a major role in the defeat of and. He also helped his trainer re-challenge the Hoenn League, whereupon they came out victorious.

In the Alola Region, Chomper mastered alongside his trainer and the pair became Alola's first Champions. At some point, they also challenged the, where they encountered and , emerging victorious. Afterwards, Chomper was sent to whilst his master traveled back to Kanto briefly before forging ahead to Galar.

Though Ryan did not use Chomper throughout much of his time in the Galar Region, the two reunited when he reached the. Together they not only defended their title for Champion of Galar, but also fought and defeated the Galar. In Galar, Chomper lost his ability to Mega Evolve, but learned to compensate for this loss with. He also gained his, Rough Skin, after Ryan gave him an.

Trivia

 * Chomper has won the most Championships of any of Ryan's Pokémon, currently clocking in at 4: Kalos,,  , and.
 * He has also triumphed over the most non-League challenges out of all of Ryan's Pokémon, having earned the Alola Battle Tree Ribbon and the Galar Tower Master Ribbon.