In The Legend of Thunder!, Marina used Wani-Wani to battle Jimmy's Beedrill after Pink was defeated. Jimmy then called Beedrill back and used his Typhlosion to battle the Water-type Pokémon. During the battle, Marina was revealed to be in sync with Wani-Wani's actions. Despite the type disadvantage, Typhlosion managed to stand up to Wani-Wani's attacks.
However, the battle ended without a winner being declared because Marina and Jimmy ended up seeing from a distance the change in climate caused by Team Rocket's attack on Raikou. Shortly afterwards, Wani-Wani was returned to its Poké Ball.
Despite Wani-Wani's brief appearance in The Legend of Thunder!, it was shown to be in sync with its Trainer and was able to hold its own during battle. After it evolved sometime before A Stand-Up Sit-Down!, Wani-Wani was also shown to have good performing skills as Marina was able to earn the title of Top Coordinator.