Mamoswine clears the front with Stealth Rock and dual Ice-type moves, while Dragapult's Infiltrator-boosted Speed closes out the late game in this mixed physical/special build. Umbreon's Toxic and Foul Play handle long-game pressure. Once Stealth Rock and Toxic are both up, the opponent's HP management burden grows sharply.
Mamoswine (Focus Sash, Oblivious): Earthquake / Ice Shard / Icicle Crash / Stealth Rock. Combines Stealth Rock with Earthquake/Ice coverage to simultaneously pressure Dragon/Flying walls.
Mega Venusaur (Chlorophyll): Giga Drain / Sludge Bomb / Earth Power / Synthesis. A sustained attacker with Synthesis recovery and a wide range of special coverage moves.
Skeledirge (Sitrus Berry, Unaware): Torch Song / Shadow Ball / Will-O-Wisp / Slack Off. Unaware means no accuracy worries for landing its STAB moves, and Will-O-Wisp neutralizes physical attackers.
Staraptor (Choice Scarf, Reckless): Brave Bird / Close Combat / Final Gambit / U-turn. A Scarf attacker whose power is greatly boosted by Reckless, closing safely with U-turn.
Umbreon (Leftovers, Inner Focus): Foul Play / Moonlight / Snarl / Toxic. A stall-style support that gradually grinds down the opponent with Toxic and Moonlight recovery.
Dragapult (Life Orb, Infiltrator): Draco Meteor / Shadow Ball / Flamethrower / Substitute. Uses its high Speed from Infiltrator to close out with STAB after Substitute.