I would be a Pikachu, since most of my friends see me as one, that and Pikachu was my very first Pokemon. Honestly, I think I would be a Victini, since I tend to be shy and sensitive.
I would be a Vulpix as they are calm and quiet, but not totally whimpy, or I'd like to be an Arcanine because they have a pride look, they are fluffy, and I'd start as growlithe whom I also like.
As for ledgendary, I would want to be Latias!!
I'd be a Bulbasaur/Ivysaur. They just interest me. If I were legendary i'd probably be Girintina. I would love to traverse through alternate dimensions.