- It has a x4 weakness to Stealth Rock, one of the most popular moves in the game. This means its health is cut in half every time it switches in when Rocks are laid out.
- Flying is a terrible offensive typing, so it's side Flying type is really only providing it with extra weaknesses.
- Without sunlight, it is just another generic Fire-type that is outclassed by many Fire types already in the higher tiers. Plus, all Fire types benefit from sunlight, so in this way it is outclassed.
Basically, it just has trouble fitting in with higher tiers. Don't let it's strong appearance and popularity fool you.