Snorlax

Snorlax is the team's one shot swing option, built around Fissure's guaranteed OHKO whenever it lands despite the move's notoriously low accuracy. Impish nature with heavy Defense investment and a smaller Special Defense split keeps it alive long enough to get repeated Fissure attempts off, and Thick Fat halves incoming Fire and Ice damage from exactly the attackers built to threaten it. Yawn forces a swap or a sleep turn, opening a safer window for Fissure next turn. Double-Edge is the reliable damage option on turns where the coin flip isn't worth the risk. Sitrus Berry stretches its staying power further.