Chuck then switched Hitmonlee for Hitmontop, which greatly damaged Rhydon with his ability to attack multiple times while spinning. Eventually, Chuck had Hitmontop attack from the air by using his horn as a drill. Rhydon countered with his own Horn Drill and caused Hitmontop to slow down by reversing the rotation of his drill, leading to Hitmontop's defeat and Blue's victory. After the battle, Blue revealed he trained Rhydon to a high level with a book titled Secrets of the Earth, which was written by the previous Viridian Gym Leader, who had been a Ground-typespecialist.
In Don't Doubt Deoxys, Rhydon battled Orm and his Shuckle on Six Island. With his drills, Rhydon broke the horde of Shuckle Orm was using to keep Blue pinned down, and defeated Orm's Shuckle, which had been giving the horde orders.
In Right on Time, Rhydon, Rhydon helped to slow the descent of Team Rocket's airship to prevent its crash-landing into Vermilion City. However, ultimately, it was Mew who saved it. In Phew for Mew, Blue gave SilverSecrets of the Earth, telling him that the book suggested that Rhydon can evolve further and that the evolution involves trading. Since trading was Silver's specialty, Blue tasked Silver with discovering the process.
In Raising the Stakes with Rhyperior, it was revealed that Blue and Silver traded Pokémon. With the Protector he received from Silver, Rhydon evolved into a Rhyperior. Afterward, Blue then decided to give Rhyperior to Silver so that he may fill the missing slot in his party. Rhyperior was first seen with Silver battling Ariana on Route 38. With an Earth Plate-boosted Earth Power, he distracted Ariana long enough for Silver to escape and head to Ecruteak City to meet with Morty. When Silver arrived at the Ecruteak Gym, he was stopped by Falkner, Bugsy, and Chuck, who were protecting the Gym from suspicious people under Morty's request. Having no time to explain the situation, Silver battled the three Gym Leaders in order to force his way into the Gym. Chuck used his Hitmontop to battle Rhyperior, but the two Pokémon stopped when their drills collided, both realizing that they had fought each other in the past. After Silver explained who Rhyperior originally belonged to, Chuck decided to trust Silver and allowed him into the Gym.
In Yveltal Steals, Rhyperior tried to help suppress Mewtwo's rage at the Pokémon Village alongside Charizard, Marisso, and Salamè. Despite their numbers, Mewtwo kept the advantage, easily knocking them away with Psywave.
Personality and characteristics
Rhyperior, like all of Blue's Pokémon, is serious and determined. He has a high amount of loyalty to his Trainer due to the amount of training he received and the care Blue gave him. Because of this training, Rhyperior is very powerful Pokémon and was the powerhouse of Silver's team when he was with him. Rhyperior has a tough exterior and can walk through magma of up to two thousand degrees without taking any damage. He has the ability to sense things underground, shown when he found a buried Diantha.