Like title... I think it's better that other people choose what they see you as, but feel free to state what you think you might be, if you want.
We have enough Pokémon fans that this should be fine. Basically, what pokémon does the user who last posted remind you of and why? That or what Type or Ability they'd have. Or something.
It might be hard to choose, because there are so many pokémon with all these different attributes, but just do your best it aims to be fun.