Michelle

While on their way to Fallarbor Town, Ash and his friends noticed a Bagon trying to jump off of a cliff. As it turns out, the Bagon belonged to Michelle. She informed Ash and the others that it wanted to evolve into a Salamence so that it could fly.

When Meowth heard about this, he immediately decided to help Bagon accomplish its goal, in addition to get the Dragon Pokémon on Team Rocket's side. Using a jet pack, he took Bagon and flew away with it. Thanks to Ash and his Pokémon, Bagon was saved from the evil trio. Immediately after its rescue, it evolved into Shelgon.