Blaise sent Swellow out after he, Tabitha and Courtney captured Ruby, Captain Stern, Dock and the Pokémon fan club chairman.
Blaise flew with Swellow and met up with Tabitha (whom he rescued) and Courtney. Together, they faced the Gym Leaders, who wanted to stop Groudon. Thus, Blaise, who flew with Swellow, took Brawly in the Lilycove Museum, where they had their battle.
After the crisis of Hoenn was over, Blaise was searching for the Red and Blue Orbs with Swellow.
Once he and Amber managed to have Hoopa summon Kyogre and Groudon, as well as having Blaise's Slugma distract Ruby and Emerald with the illusions, Blaise flew with Swellow to track Kyogre and Groudon down with Amber.
Seeing Maxie and Archie controlling Kyogre and Groudon, Amber and Blaise flew from Giovanni's airship to meet up with them.
None of Swellow's moves are known.