Silver stole this Totodile from Professor Elm as one of Lance's missions. Later on, he refused to return when Gold attempted to bring it back to Prof. Elm since he grew attached to Silver. He soon evolved into a Croconaw after defeating a trap together with Gold's Cyndaquil in the Sprout Tower, and in this new form he was seen around Silver frequently, including his first meeting with the Masked Man and in a match with Gold, where he overwhelmed the newly evolved Exbo with its Water Gun.
In the battle against Lugia at the Whirl Islands, he evolved into his final stage together with Exbo and Megaree, and used his Surf as Silver's other two water Pokémon used Waterfall and Whirlpool so that he may enter Lance's hidden chamber.
Teaming up with the other starter Pokémon at the time, Feraligatr faced Will and Karen in the final battle, defeating the former with its Return attack, and participated in the final battle against the Masked Man.
In the FireRed & LeafGreen arc, he was scarcely seen, however, he uses Hydro Pump with his teammates to propel the plummeting Team Rocket battleship to stop it from hitting Vermilion City.
In the Emerald arc, he learned Hydro Cannon, from Ultima's bracelets, after Silver and the other Pokédex owners were unpetrified, in an unbelievably short time, even moreso than Green and the Hoenn Pokédex holders. Meanwhile, it took Gold two months to perfect his technique.
In the HeartGold & SoulSilver arc, Feraligatr used Hydro Cannon twice, first to defeat a swarm of Koffing that tried to ambush Silver, second in a futile attempt to stop Arceus' creation process by destroying Giratina. The second use of Hydro Cannon was commanded by Gold, because Silver had been blinded.
