A Blast From the Past!
After you complete every coloseum you get the little yellow cute thing with a surfboard. You guest it right! You get a surfing Pikachu! You can transfer this pokemon straight to your DS game! It's at Lv. 40 w/ a random gender. I call it a blast from the past becouse you can get a surfing pikachu in Pokemon Stadium for N64. Made from "way back when".