Ash's Pikachu/History/Best Wishes series/Decolore Islands

In Cilan and the Case of the Purrloin Witness!, Pikachu participated in the Marine Cup Tournament. He managed to beat other Trainers with a and an  and make it to the finals. He battled against Teaque's. After a tough battle, Pikachu was able to knock out Galvantula with Iron Tail, winning the tournament for Ash.

In Best Wishes Until We Meet Again!, Pikachu, along with was captured by Team Rocket, while Ash, Iris and  were trapped inside the ship's cargo space. He was eventually freed out of the net and together with Axew using Dragon Rage, Charizard using Flamethrower and using Solar Beam, Pikachu used Thunderbolt to blast Team Rocket off. Later, Pikachu said farewell to Axew, Iris and Cilan as he, Ash and Alexa continued on to Pallet Town.

Pikachu was reunited with Bulbasaur and the entire Unova team at Professor Oak's Laboratory in The Dream Continues!. He joined the others in a group attack on Team Rocket with his Thunderbolt to send them blasting off for the last time in the Best Wishes series. Pikachu then continued to travel with Ash when he set off for the Kalos region.