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.
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.
Feraligatr and Silver
In Lively Lugia (Part 2), Croconaw meets back up with Exbo and Megaree and fought against a wild Lugia at the Whirl Islands. When Lugia attempts to crush them under its weight, Croconaw, Exbo, and Megaree work together to hold Lugia up. The strain of this causes Croconaw, Exbo, and Megaree to evolve into Feraligatr, Typhlosion, and Meganium, respectively. Though they succeed in saving their Trainers, Lugia eventually escapes.
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.