Mega Scolipede

Mega Scolipede trades its excellent pre-mega Speed Boost for Shell Armor on evolving, so the plan is to hold off mega evolving while Speed Boost stacks, or lean on Fake Out support to set up Swords Dance safely once it does. Jolly with maxed HP and near-maxed Speed offsets the drop that comes with mega evolving, while the leftover SP rounds out Attack. Leech Life and Poison Jab both double as STAB and HP recovery, letting it tank hits from the newly boosted Defense and Special Defense while Swords Dance turns its middling Attack into a real breaker.