Mega Venusaur

Thick Fat halves both Fire and Ice damage received. In a team running permanent Sun from Torkoal, opposing Fire moves targeting Mega Venusaur are reduced to 25% of normal damage, making the team's own weather nearly eliminate its primary weakness. Giga Drain provides Grass STAB with HP recovery on hit for sustained longevity. Sludge Bomb is Poison STAB with a 30% poison chance. Earth Power covers Steel and Fire types. Modest maxed HP with significant SpA and SpDef investment creates a durable bulky attacker. Zero Speed for Trick Room priority. Thick Fat under Sun is the defining synergy. The team's own weather eliminates Venusaur's Fire weakness while it applies Grass and Poison coverage against opposing Water and Fairy types.