Gorebyss

Gorebyss is actually a pretty good Pokemon in RU; good Special Attack stat and decent bulk when coupled with Shell Smash, one of the best set up moves in the game is very threatening. Unfortunately it is almost completely outclassed by Omastar, a Pokemon with higher Special Attack, Speed, and bulk. The reduced Speed is especially significant, because even at +2, Gorebyss is outsped by Choice Scarf Rotom-C by one point. Gorebyss does have a few tricks up its sleeve to give it a slight niche over Omastar as a Shell Smash sweeper, including its sole Water-typing, which allows it to set up on certain Pokemon that Omastar cannot, and a wider movepool that give it some good coverage options. It is, however, very important to consider if Gorebyss is actually the right fit for your team, as more often than not you should just use Omastar.