Why didn't Ash's Torkoal ever evolve in the Pokémon anime?

Torkoal - Pokemon X torkoal Torkoal is a tortoise-like, quadrupedal Pokémon It has a large, black, rock-like shell with holes that glow with a red warmth Its skin is reddish-brown torkoal Pokemon SV Torkoal Evolutions, Type Weakness, Best Moves, Where to find and catch Torkoal an C-Tier Fire Pokemon

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