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That's a Wolpertinger Pokemon i had in mind. It's based on german folk lore and the idea is as the antlers grow it becomes more and more easily irritable.
The Wolpertinger is usually a really large rabbit, of which hunters tell a tale of that attacks hunters with its deer like antlers. The bigger the Wolpertinger, the meaner and more aggressive they become. Hunters who tell the tale of the wolpertinger usually claim it is too fast to shoot it.
So the base form could be fairy type and the evolution of it could be fairy/fighting, but i haven't finished it yet