Serpyro - Aqua Fire Pokemon
Serpyro's outer membrane is made of a substance similar to a bubble, and is able to hold a burning fire inside, while still being 100% underwater.
(It's a serpent thing, kinda like Eelektrik, but half orange and half blue with a kind of "glowing" middle, like a fire.)
Ember, Bubble, Leer,
Wrap, Will 'o' Wisp, Aqua Ring,
Whirlpool, Agility, Fire Spin,
Hydro Pump, Flamethrower, Bubbling Flare (special move)*
Is a Fire-Type attack, but provides a same-type attack bonus for both Water and Fire, and is powered up by Water items like Mystic Water as well as Fire items like Charcoal.