"OLD ART"
This is Nicolas. He had a terrible accident while being held in an experimental laboratory. Humans where trying to make their own smaller sized sun when it backfired and created a strange liquid that burned and melted almost everything it touched. Trying to save his mate, he fell into a batch of this mixture. He almost died, but was saved by a kind human. His burn like marks are the areas where skin literally melted away, but slowly started to heal afterwards.
So sad...poor poor charizard.