Lurantis @ Leftovers / Scope Lens
252 HP / 252 Attack / 4 Sp. Defense
- Leaf Blade/Petal Blizzard
- Leech Life/X-Scissor
- Night Slash/Poison Jab/Aerial Ace
Leaf Blade and Petal Blizzard have the same power and are both STAB, however, you can go with Leaf Blade if you want the higher critical hit ratio and more support from Scope Lens, or Petal Blizzard for doubles.
Superpower has high power and works really well with Contrary, it allows Lurantis' Attack and Defense to be raised so it can take a couple more physical hits and hit harder.
Leech Life and X-Scissor have the same power, but go with Leech Life if you want more HP restored.
Night Slash, Poison Jab, and Aerial Ace are for coverage. You can go with Poison Jab for the higher power, Night Slash for the higher critical hit ratio and for Scope Lens, or Aerial Ace in case your opponent spams Minimize.
I love Lurantis a lot, but unfortunately it has really low speed. If you want to use a better pure Grass type I suggest going with Tsareena, it has better stats.