My favorite OC that I found. Surprisingly enough, me as a 9 year old made it. Butstill I love it. I'm still working out stats and moves, but here is Cinder/Winter

(Just recently made this)
She is a Fire/Ice type Leafeon.
The bastards at the Type lab thrust her into a volcano, letting this poor grass type almost die until she was rescued by Misa. The Moltres let her roam the earth, but something had changed. Peridot had become Cinder, because her type had changed to Fire. A few years later, the lab recaptured her. After their success with Cinder, they put her on top of the tallest mountain in Alola, where she would have frozen if not for being a Fire Type. However, her grass typing slowly adapted, making her an ice type.

The stress from being polar opposites split her into two personalities.

Cinder, the exploding and high tempered one. She always radiates heat.

And winter, the calm and clever one. She always radiates frigid air.

She can change personalities at any moment.

She is very frail but fast. If she was ever hit by an attack, she would feel much more pain due to her unstable genetic makeup. She frequently has breathing problems and fevers/colds.

Her moves are Ice Beam, Flamethrower, Blizzard, Fire Blast.