Well, Ledgendaries Aside...Raticate. Because Raticate is a Legend in my family because of me.
One day, my brother started a game of Pokemon on Pokemon Blue. Later, I wanted to play some Pokemon, but I did not want to start a new game. I asked him if I could just play on his profile. He agreed, but told me I would have to train my own Pokemon, not his. He told me I could use his Charmander to quickly catch something of my own, and I could use that as my 'starter' pokemon. He wanted to do the Gym Battles too, so he also told me I was not allowed to leave Pallet Town. I figure, 'okay', and I go. First thing I ran into was a Ratata.
I left Pallet Town with a level 97 Raticate.
What Superpower would you want?