At some point in the past, Roark found a Cranidos fossil and revived the extinct Pokémon. Cranidos became his most powerful fighter, showing impressive speed and power as well as remarkable jumping abilities. Cranidos first appeared as Roark's last Pokémon when Paul challenged him. It defeated Paul's Chimchar, despite its legs being weakened by two Flame Wheel attacks and a battle with Elekid. Even with its injured legs, Cranidos was a formidable opponent, but Elekid eventually managed to win the battle
When Roark battled Ash, he suprised Ash and his friends by choosing Cranidos first instead of last. Cranidos easily defeated Ash's Aipom and battled Pikachu, weakening it enough to cause Ash to replace Pikachu with Turtwig. Turtwig managed to defeat Cranidos but Roark's Onix defeated both Turtwig and Pikachu.
When Team Rocket attempted to steal the fossils that Roark and Cranidos were protecting, Cranidos evolved into Rampardos in order to stop them. With its newly gained strength, Rampardos easily defeated the villains.
During Roark and Ash's rematch, Rampardos was the last Pokémon Roark used, defeating Aipom and Pikachu and very nearly winning against Turtwig before finally being knocked out by Razor Leaf.
Rampardos also appeared when Roark challenged his father, Byron, to a battle and fought Byron's Bastiodon. They seemed evenly matched but it is unknown if the battle would have ended in a draw or if one Pokémon would have defeated the other due to an interruption by Team Rocket.
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|Headbutt||Shapes of Things to Come|
|Zen Headbutt +||Shapes of Things to Come|
|Flamethrower +||Shapes of Things to Come|
|Focus Energy||Shapes of Things to Come|
|Head Smash +||A Gruff Act to follow|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.