Terrakion

Terrakion was long looked to as the potential future king of both Rock and Fighting Types. It had the potential to be a very large force in the meta that could re-shape numerous matchups moving forward and take the game by storm. But then Rampardos was given a shockingly outstanding moveset and Terrakion itself wasn't given the Fighting Type moves that it needed to surpass the Fighting Type king.

In terms of actual performance, Terrakion's only real niche is as a Rock Type attacker, and it's pretty darn good in that niche! It sits as a decent midpoint between Rampardos' massive DPS and Tyranitar's great bulk, meaning it can pull its own weight and can easily fill in the Smack Down Tyranitar-sized hole in the rosters of players who missed its Community Day.

Worth noting is the fact that Sacred Sword, the Fighting Type signature move of the Swords of Justice, has been named in the game's data, meaning it may yet get a chance to take the Fighter's crown in the future... if it also gets a Fighting Type fast move.