In Totodile Rock, Totodile fought against Exbo in the Sprout Tower. The two start out with Tackle and Scratch and follow up with Ember and Water Gun, giving Totodile the lead. Due to this Exbo counters with Smokescreen and gives Gold a chance to take Totodile back, but he refuses and bites him. The smoke soon sets off an alarm in the tower and activates its traps, forcing the two Pokémon to team up and stop them. In the confusion Silver escapes and Totodile evolves into Croconaw.
As a Croconaw
In Tyranitar War, Croconaw was Silver's first choice in his battle against Gold and fought against Exbo again. Croconaw starts by drenching Exbo with Water Gun and biting down on him with Bite. Exbo manages to dodge the attack with Double Team, breaking Croconaw's teeth. Croconaw recovers though and throws Exbo away.
In Lively Lugia II, Croconaw fought against a wild Lugia and meets back up with Exbo and Megaree. After a tiring battle with Lugia the three starters evolve into their final form due to the stress of the battle and the encouragement of the others. Gold then attempts to capture Lugia, but it escapes.
In Storming the Forretress, after Giovanni was defeated and Carr sent the flying airship containing him, Silver, his loyal subordinates, and enemies crashing, Feraligatr teamed up with the other Water-type Pokémon to try to keep the airship in place. However, ultimately, it was Mew who saved it. After this he was petrified alongside his Trainer.
Since Feraligatr debuted he has been shown to be a competitive Pokémon. He appears to care very much about Silver to the point of not responding to Gold and Exbo's plea to come back to them, even though he had only been with Silver a short time. This is further expressed when his most powerful friendship-related attack changes from Frustration to Return to highlight his trust and loyalty toward his Trainer.