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In Entranced by Entei, during the Gym Leader exhibition match at the Indigo Plateau, Blue faced his former mentor, Chuck. During this battle, Blue decided to only use Rhydon. Rhydon first went up against Chuck's Machamp, which let Rhydon hit first so that it could use Vital Throw, which always makes the user go last. Next, Chuck switched Machamp with his Hitmonlee, which used Mind Reader to dodge Rhydon's attacks. Rhydon managed to grab Hitmonlee's stretchy legs and attacked with Stomp, only to be countered with Reversal. Chuck then switched Hitmonlee for a Hitmontop, which greatly damaged Rhydon with its ability to attack multiple times while spinning. Eventually, Chuck had Hitmontop attack from the air by using its horn as a drill. Rhydon countered with its own Horn Drill and caused Hitmontop to slow down by reversing the rotation of its 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-type specialist.
In Double Dealing with Deoxys, Blue used Rhydon to battle Red to determine which one would learn one of the special moves from Ultima. With its Lightning RodAbility, Rhydon redirected the Electric attacks fired by Pika to prevent them from hitting Machamp.
In Don't Doubt Deoxys, Rhydon was used to battle Orm on Six Island. With its drills, Rhydon broke the horde of Shuckle Orm was using to keep Blue pinned down. Near the end of the fifth chapter, Rhydon was used to help slow the descent of the Team Rocket airship to prevent its crash-landing into Vermilion City.
In Raising the Stakes with Rhyperior, it was revealed that Blue and Silvertraded 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 used to battle Ariana on Route 38. With an Earth Plate-boosted Earth Power, it distracted Ariana long enough for Silver to escape and head to Ecruteak City to meet with Morty. When Silver arrived at the 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 against 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 Pinsir Glares, it was revealed that Blue took Rhyperior back from Silver in order to help him find Zygarde. Rhyperior was first seen helping Diantha emerge from underground, where she was put in order to escape the blast of the ultimate weapon. He, along with Charizard, later led X's group to Anistar City, after which they left and returned to Blue.
Personality and characteristics
Rhyperior, like all of Blue's Pokémon, is a very serious and determined Pokémon. He is also very loyal to his Trainer, due to the amount of training he received and the care Blue gave him. Rhyperior is a very powerful Pokémon and was the powerhouse of Silver's team when he was with him.
A † shows that the move was used recently, unless all moves fit this case or there are fewer than five known moves.
Trivia
In the original Generation Igames and their remakes, Blue uses a Rhydon in the Champion battle. He also uses Rhydon in the Gym battle during the Generation II games and their remakes, as well as the Round 1 battle of Pokémon Stadium 2. In HeartGold and SoulSilver, it has evolved into a Rhyperior by the time of the rematch. Rhydon does not appear during the FireRed and LeafGreen rematches, instead being replaced by Tyranitar.