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I think you are a croagunk because I didn't want to be lazy and uncreative by saying "poliwag/poliwhirl/poliwrath/politoed" so I just picked the next frog pokemon I could think of.
EDIT: Crud, I was beaten! Okay, you little trickster can be a sneasel, fast and sneaky in order to beat me to the post!
Well, your usertitle says girl, but articuno is genderless. (In game, at least). So Imma make you a froslass, since they're always girls and ice types.
Scyther came to mind when I read your username...not sure why. I think it's because "The Bringer" sounds menacing and Scyther's sort of a menacing Pokemon.