Honestly if you're going for a defensive Leafeon, you should consider Vileplume or Tangela but here's a physical wall Leafeon:
Leafeon(252 HP 252 Defense 4 Attack) @ Leftovers
Impish Nature
-Synthesis
-Aromatherapy/Toxic/Swords Dance/Wish
-Leaf Blade
-Knock Off
Knock Off is good coverage and taking away your opponent's item is always nice. IMO Wish passing from Leafeon isn't very great as it only has 65 base and Synthesis grants more reliable recovery.
Like Punchshroom mentioned, a SD set is better. I would suggest something like:
SD, Baton Pass, Sub/Synthesis and Leaf Blade.
SD, Baton Pass, Leaf Blade and Knock Off/X-Scissor.
SD, Synthesis/Substitute, Leaf Blade and Knock Off/X-Scissor.
Run max speed with Jolly nature or 224 speed Jolly for base 90s, share the other evs into attack and/or bulk. Leftovers or Life Orb for item. Maybe even Lum Berry, Salac Berry or the grass boosting item.
X-Scissor is to let you hit other grass and dark types hard, namely Malamar and Cacturne. Also hits Lilligant, Leafeon and other mono grass types harder. Knock Off is preferred but Malamar is a huge nuisance.
Thanks, i more than expected . Ima try him with a sysntesis life orb set !