Black T-Rex is a mutant gigantic Dinosaur bigger than other Tyrannosauruses and other Dinosaurs. It was created by Seth who have betrayed the Alpha Gang. Later in Dinosaur War the Black T-Rex is destroyed for good.
- The Black T-Rex will be revived by the Villains in Team Robot In Pokemon XY The Series in the XY&Z arc. It then attacks Lumiose City to create a beautiful world for Lysandre and then fight the heroes in the final battle.