I think it uses the cannon on it's back.But I'm not sure.So,how in the world can it use Fly?
Well, and this is a longshot opinion, maybe by using the move Magnet Rise. It is one of its starting moves. It does not have wings, and unless it can point the cannon back and use it as a rocket, this is all it can do.
Again, my own opinion.
That's how GameFreak wanted it to be like. We don't know.
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