Mega Chesnaught's core strategy revolves around maximizing its HP and Defense, then repeatedly boosting its already impressive physical bulk with Iron Defense. Synthesis provides crucial recovery, enabling it to sustain through prolonged setup phases against physical attackers. This elevated defense directly scales the power of Body Press, allowing Mega Chesnaught to deal massive damage. It can even overcome physical Flying-type Pokémon, turning previously resisted hits into one-shots after sufficient Iron Defense boosts. Furthermore, Mega Chesnaught's naturally low Speed stat makes it a surprising beneficiary of an opponent's Trick Room, allowing it to move first and dictate tempo.