While traveling through Johto, Ash and his friends met Raiden in Rikishii Town. He was the current champion of the town's sumo competition, and was entering again to defend his title. Ash entered the competition as well with his Snorlax.
Eventually, the two ended up facing each other in the final round of the tournament. Raiden was using his Feraligatr, who had helped him reach victory in the previous year's competition. However, the Water type was no match for Ash's Snorlax, who ended up defeating the champion, winning Ash a King's Rock and a large supply of food.
Although he lost, Raiden wasn't upset. He was happy to have faced Ash and congratulated him on his victory.
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| Raiden's Feraligatr is Raiden's only known Pokémon, which he trained for the Sumo Conference in Rikishii Town. It was first seen training against a Nidoking and after that was shown to be very strong against a Heracross and a Granbull. Then at the Sumo Conference, Team Rocket were causing havoc by falsely entering a Pokémon that did not match the qualifications and sent them blasting off with a Hydro Pump. Feraligatr's first match was against a Golem. Ash and his friends thought this would be a tough battle because of the weight disadvantage, but it was able to knock Golem out with one hit.
Its next on-screen match was against a very strong Blastoise. The match could go any way, but in the end Feraligatr managed to win and proceeded to the finals where he would fight against Ash's Snorlax. In the final, Snorlax made the first move, but Feraligatr dodged it. Because of this, Snorlax barely managed to retain its balance. Teetering on the edge of the ring, it still managed to dodge Feraligatr's attack. Raiden was shocked but also impressed with how deceptively agile Snorlax was. Both of them then made an impressive move, but as Feraligatr was about to push Snorlax out of the ring, Ash told Snorlax to take a deep breath. Using its stomach to push Feraligatr away, it managed to save itself. However, Feraligatr managed to toss Snorlax, though Snorlax managed to land safely in the ring with a huge impact, causing the entire stadium to shake. Due to this, Feraligatr lost its balance and Snorlax managed to push it out of the ring, winning the match and the competition.
Feraligatr's only known move is Hydro Pump.