It's really up to your preference and what you're building around it, in my opinion SD would be best, getting locked into Knock Off can be annoying against mons that have Z Moves and Mega Stones, and can interrupt your sweep with the bad base power and no STAB. Fightinium Z is what I have had most success with, getting rid of those Steel types is so helpful without relying on team members and the nuke for Beast Boost can help get a sweep going, especially after Swords Dance. Grassium Z could work if you really want Smart Strike in that last slot.In what set would Knock Off be best for Kartana? SD with STAB? SubSD? Scarf, dropping Defog maybe?
Kartana @ Fightinium Z
Ability: Beast Boost
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Leaf Blade
- Knock Off
- Sacred Sword