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Because you live in Obama's socialist Unova, you can only ever possess three Pokemon at a time. You can have them for whatever reason (battling, companionship, contests, protection, etc.).
So what three do you pick and why?
Scrafty - Cool mohawk lizard, able to gift me small stolen objects / beat up my adversaries.
Scolipede - A friggin' poison bug-horse. Simply majestic.
Emolga - Cute little flying rodent. Girls love these sort of things.