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Regardless of which Pokemon you choose, your rival gets a level 100 Rayquaza, and says "hhhahahahaahahha fug u bitch" instead of his regular dialogue. He uses his normal Pokemon for the rest of the game, but after you beat Lance, he shows up again, says "ur a fag", and only after you beat him and his team of 6 level 100 Rayquazas do you get to enter the hall of fame.