What is the Best Pokemon for a One Pokemon Challenge in B2/W2?

Question

So I want to do a one Pokemon run-through of Pokemon White 2.
This means I can only use 1 Pokemon throughout the WHOLE game.

What Pokemon should I use?

No Legendaries
No Shedninja
Pokemon that can evolve once or twice would be good c:
Pokemon that aren't starters would be a fun twist :P
no Missingno

It could be any Pokemon, it is not limited to Pokemon only caught in B2/W2

Answer 1

as for what the best is, i'm not going to say.

but for what i'd do, take your favorite Pokemon. then you can have the memory of doing the challenge with your favorite. my favorite is the eevee family but I also love poison types, so i'd take a special atk sheer force nidoking with me.

or if you want ultimate bragging rights, male combee