I'm honestly surprised at myself for this one but it's actually the fire starter's final evolution form Pyroar. For some reason I found myself giving this guy much more of a personality in my mind then I did any other of my pokemon. After thant It's Nebby/cosmog/title legendary as it's a pokemon you get from a friend in the game that I actually cared about. I miss Lillie...
Litten's final evo isn't called Pyroar, it's Incineroar... I guess you got confused with Litleo who evolves into Pyroar.