Aegislash

Wide Guard blocks all spread moves for both sides on the turn it's used. Enabling Garchomp's Earthquake spam by shielding allies from opposing spread moves while Earthquake only hits the opposing side. Flash Cannon covers Fairy and Ice types threatening the team. King's Shield blocks most moves and drops contact attackers' Attack by two stages. Substitute creates a buffer forcing opponents to break it before reaching Aegislash directly. Calm maxed HP with SpA and Speed investment creates moderate offensive threat alongside utility. Leftovers sustains across a long game. Wide Guard removes the symmetric damage that would otherwise make spread move exchanges unfavorable. Heat Wave, Surf, and opposing Earthquakes become one-sided threats.