Ability -- Harvest
Nature -- Adamant
EVs -- 252 HP, 128 Atk, 128 Spd
Dragon Dance -- Stats
Rest -- Heal off damage, combo with Lum + Harvest
Bullet Seed -- STAB. Breaks subs that could easily be set up on you while dancing
Earthquake -- Strong coverage, hits a lot of types that Bullet Seed doesn't hit well
EVs give decent enough bulk, while still letting Tropius have the chance to potentially sweep after 2 dragon dances, preferably 3. Harvest + Lum sweeper set is nice.