Hello aeo. I would relish the opportunity to be a beta tester for Pokemon Showdown.
My favorite Pokemon is Terrakion. Its power and speed allow it to apply pressure to pretty much all of OU, and its incredible STAB moves allow it to run a double boosting set without fear of losing too much coverage, a statement that many Pokemon in OU cannot boast. Its speed also allows it to revenge kill most of OU quite efficiently. In fact, it just might be the best sweeper in the OU metagame!