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Pokemon is completely different from the game and show. Games, they never show fatigue cause who wants to play a game where they need a day to regain their strength. Pokemon centers probably restore health for pokemon but not fatigue. Maybe they can only fight about 2 times a day. Imagine if someone told u to fight multiple people over n over all day. They could restore the bruises on your face but you only have the strength for a couple people. That could be why he doesnt use him so much.