Rhyhorn is a rhinoceros-like creature with a body covered in gray, rocky plates. Its underside and rear are smooth, and it has four short legs with two claws on each foot. It has a triangular head with narrow, red eyes, two fangs protruding from its upper jaw, and small, triangular openings on the upper sides. A spiked ridge runs along its back, and it has a single short horn on the tip of its snout. The female has a shorter horn than the male. In addition to its rocky hide, its bones are a thousand times harder than human bones.
Rhyhorn's brain is very small, giving it a one-track mind. When it runs, it forgets why it started and continues until it falls asleep. However, it may recall the reason upon demolishing something. Rhyhorn runs in a straight line due to its short legs making it inept at turning. It does not care if obstacles get in the way, merely smashing through them or sending them flying. Sometimes it may feel pain the day after a collision. Rhyhorn lives in rough terrain.
In the main series
Major appearances
A Rhyhorn appeared in Bulbasaur's Mysterious Garden, under the ownership of a Hiker. Ash's Bulbasaur defeated it in battle.
A Rhyhorn owned by Corey was one of the Pokémon that was captured and cloned by Mewtwo in Mewtwo Strikes Back. The Rhyhorn clone reappeared in Mewtwo Returns, having by this point bred a baby Rhyhorn with the clone of Fergus's Nidoqueen.
The first Pokémon that Ash and his friends saw at Pinkan Island in In the Pink was a Rhyhorn, which was pink in color. Although it was initially unaware of the trio, Ash rushed up to it and antagonized it. It then cornered the gang at the edge of a cliff, and attempted to charge at them, but the group was saved by Togepi using Teleport via Metronome, causing Rhyhorn to charge over the cliff. It was then rescued by Ash and his friends with the help of the resident Officer Jenny.
A Rhyhorn charged at Ash's Donphan after it had angered it by accident in Odd Pokémon Out.
Grace has a Rhyhorn, which debuted in Kalos, Where Dreams and Adventures Begin!. It was used in many races when Grace was younger. Rhyhorn was used by Serena as part of her Rhyhorn training before she left home. Rhyhorn later reappeared in A Race for Home! alongside Grace before reappearing in a flashback in A Showcase Debut!. Rhyhorn was later seen watching Serena's performances in Performing with Fiery Charm! and Master Class is in Session!.
Multiple Rhyhorn appeared in Giving Chase at the Rhyhorn Race!, including one that belongs to Ian.
A Rhyhorn appeared in Diancie and the Cocoon of Destruction. It was borrowed from the Rhyhorn racing track of Orsay City by Serena, Clemont, Bonnie, and Diancie, who used it to escape from Merilyn and Riot. Rhyhorn quickly ran past the racers on the track, before going off-track and riding inside a forest. After the group got to safety, Serena thanked Rhyhorn for its help and it went back to the racing track.
A Rhyhorn appeared in A Race for Home!, where Serena hijacked it to chase after Team Rocket, who stole cheese.
Multiple Rhyhorn appeared in Master Class Choices!, where they were used as part of the Theme Performance of the Fleurrh City Pokémon Showcase. The Performers had to attract the most Rhyhorn is a certain period of time. Serena found that most of the Rhyhorn were attracted to her, allowing her to advance to the next performance. Amelia had her Shiny Dragonair and Espeon use Attract to bring them over.
Minor appearances
Rhyhorn debuted in The Flame Pokémon-athon!, where it entered a race with its Trainer. Rhyhorn jumped onto a stone but they sank due to Rhyhorn's weight, and both were eliminated from the race.
A Rhyhorn appeared in the banned episode EP035. Ash attempted to capture it in the Safari Zone, but it got away.
A Rhyhorn appeared in A Chansey Operation, where it was one of the injured Pokémon brought to the clinic.
Multiple Rhyhorn were among the Pokémon seen at Professor Oak's Laboratory in Showdown at the Po-ké Corral and The Rivalry Revival.
A Rhyhorn appeared in The Power of One.
Two Rhyhorn were seen at Professor Oak's Laboratory in A Tent Situation.
A Rhyhorn was one of the Pokémon seen at the Pokémon Swap Meet in Tricks of the Trade.
A Rhyhorn appeared in The Legend of Thunder!.
Multiple Rhyhorn appeared in Celebi: The Voice of the Forest, Pokémon Heroes: Latios & Latias, and Destiny Deoxys.
A Rhyhorn appeared in Johto Photo Finish, under the ownership of Jon Dickson. It defeated Harrison's Houndoom and knocked Harrison out of the Silver Conference.
A Rhyhorn appeared in Numero Uno Articuno, under the ownership of Noland.
Multiple Rhyhorn appeared in Lucario and the Mystery of Mew as part of the feuding armies.
A Rhyhorn was used by the henchmen of J's client was amongst the group of Pokémon used to attack Dawn, Brock, Officer Jenny, and Solana in Pokémon Ranger and the Kidnapped Riolu! Part Two.
A Rhyhorn appeared in Camping It Up!.
Multiple Rhyhorn were caught by the Pokémon Pinchers in Pokémon Ranger: Guardian Signs (Part One).
A Rhyhorn appeared in the opening sequences of Giratina and the Sky Warrior and Zoroark: Master of Illusions.
Multiple Rhyhorn appeared in a flashback in A Showcase Debut!.
A Rhyhorn appeared in I Choose You!.
Pokédex entries
Episode
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Pokémon
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Source
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Entry
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EP035
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Rhyhorn
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Ash's Pokédex
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Rhyhorn, the Spikes Pokémon. It's covered in a tough armor, giving its Tackle attack an extraordinarily destructive power.
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Original series entries continue below.
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Episode
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Pokémon
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Source
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Entry
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EP088
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Rhyhorn
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Ash's Pokédex
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Rhyhorn, the Spiked Pokémon. Rhyhorn is known for its physical power and its considerable offensive and defensive battle skills.
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Episode
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Pokémon
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Source
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Entry
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XY007
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Rhyhorn
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Ash's Pokédex
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Rhyhorn, the Spikes Pokémon. Rhyhorn recklessly charges straight ahead, trampling over anything that gets in its way.
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In Pokémon Origins
A Rhyhorn appeared in File 3: Giovanni, where Giovanni sent it out for his Gym battle against Red. It took out most of his team and tied against his Hitmonlee.