Mauzi functions as a core Team Rocket member during the Unova storyline, executing Giovanni's missions alongside Jessie and James, including their initial assignment upon arrival. On a mountain trail toward Nimbasa City, Mauzi's negotiation abilities become pivotal amid a conflict between rival Beartic factions. After a storm strands a Cubchoo, Mauzi translates its plight to the protagonists, explaining its separation from the group. When the Beartic factions clash over storm-depleted berry supplies, Mauzi locates berries and offers them to one faction, leveraging communication to de-escalate tensions. Though initially rebuffed, these efforts aid in conflict resolution.

Earlier, at a Battle Club, Mauzi participated in a food theft operation. Surveillance footage first implicated an Umbreon, but Mauzi was later revealed stealing food with an undernourished wild Tepig. Mauzi consistently displays attraction to shiny objects across Unova missions, aligning with its Pokédex trait of eyes that brightly glitter when spotting glittering items.