I.... how can I say this in a better way. I don't like this Pokemon because It has Two 4x Weaknesses which is ermmm BAD. Leavanny ( M )
EVs: 325 Attack , 231 Defense , 301 Speed. :Adamant Modest: 261 Sp.Atk , 231 Defense , 301 Speed and 241 Attack. P.S. Mine is Modest and it has these stats. ^^
Leaf Blade: STAB Cool move because of STAB and high Critical hit-ratio.
XSisscor: STAB Another good move because of STAB and high critical hit-ratio.
Swords Dance: Useful move for Leaf Blade and Xsisscor.
Return/Bug Bite: Both good moves , I don't know which to pick.
Pros & Cons.
Pro: High attack. Good power with Leaf Blade and Swords Dance together. Decent speed and useful for alot of moves to coverage elite four or champion. HIgh Defense to avoid some moves that is pyshical. For example: Fire Fang. To avoid Fire/Flying types/moves , use a Focus Sash/Focus Band to endure it.
Con: It has low Health , It will get KO Hit by FIre and Flying types. Leavanny has LOW Special Defense , Special fire moves and flying moves with KO HIt it badly. Least but not least , Special Attack. I don't know why Burgh will give Leavanny Struggle Bug if Struggle Bug is Special and It has LOW Special Attack and Struggle Bug has LOW Power also , it is kinda useful because It lowers Special Attack stat and since Leavanny has LOW Sp.Def , IT will be perfect for Leavanny sometimes ( unless it has Modest Nature or Rash Nature it'll be OK).
I did Pros and Cons to show how Leavanny is perfect or not. I really hope this helps because I did alot of work on this. Good luck on your adventure Trachy.^^