Dragon Welp

Evolved from a Fire Spirit, learning Bite in the process. Alternatively they can be captured in lava portals, or in intense heat weather. Can also be found in the lost egg, cave exploration events. They can be evolved into five different types; an Average Level Type that learns Ram, an Endurance Level Type that learns Regenerate, a Strength Level Type that learns FireClaws, a Support Level Type that learns FireTongue, or a Dexterity Level Type that learns FireLeap.

It's not much of an upgrade from the Fire Spirit in terms of stats. You put up with it because the Fire Dragon it evolves into is awesome. However they're bugged in version 0.18.0.1 and are unable to evolve further due to the button not doing anything, so avoid it in that version.