You can't. He's only in Time.
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On Pokemon Mystery Dungeon: Explorers of Time/Darkness, you take a survey at the beginning of the game. The answers you chose will determine what Pokemon you are most like, and you will be that Pokemon.
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There isn't one
evolve all of your pokemon,recruit all the legendary pokemon.
No... there is no regigigas in Pokemon Mystery Dungeon Blue Rescue Team. Do you know why? If not... I will tell you. This is because regigigas is one of those new Pokemon from the sinnoh region which was not invented during the time of Pokemon Mystery Dungeon Blue Rescue Team. However, I believe you can find a regigigas in Pokemon Mystery Dungeon Explorers of Time, Darkness, and Sky.