Doom the Gyrados VS Raichu the uh.. Raichu. Awesome, can't wait.
As for a subtitle, Doctor Doom travels through Kanto with a Magikarp as his starter: A Shocking Twist
As for another gym-type play on words.
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Garrus Vakarian's favorite store on the Citadel, is himself. He dishes out pain at unbelievable prices.