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

Why didn't Ash's Torkoal ever evolve in the Pokémon anime? torkoal Hey, in your game dont have the ability Drought of Torkoal This pokemon has the ability Drought, see this link: 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 Torkoal is a Pokemon available in Pokemon Brilliant Diamond and Shining Pearl Learn about how to get Torkoal with detailed locations

torkoal Torkoal It's sure been a while since we've bumped into one of these forgotten, low-tier, one-stage underdogs, hasn't it? The pure fire-type Torkoal is pretty Torkoal ; Base stats HP 70, Atk 85, Def 140, Speed 20, 85, 70 Total: 470 ; Catch rate 90 Base exp yield 161 ; Egg group