@cold-eye:
Zen Headbutt has an actual use on Metagross for hitting Rotom-a hard on the switchin (and maybe Zapdos, haven't done any calcs). Obviously, this is not particularly useful in ubers. Zen Headbutt probably should not be used on an ou lead either, hitting only Infernape #6, Roserade #7, Machamp #16 and Crobat #17 any harder than earthquake or meteor mash (you should probably run from ape regardless, roserade is beaten anyway if you have lum, and Machamp and Crobat are relatively uncommon...).
As far as trickscarf on an ou lead, there's a set for it on the analysis. No idea how it performs in ubers, though I suspect poorly, as it doesn't outspeed Deoxys-s or Deoxys-a, gets slept by Darkrai, and loses to Groudon...
@Cipher Admin Lovrina:
You could run a momento-sleep powder Jumpluff to support a scary set-up sweeper
What's the best OU team for a Sleep Powder/Leech Seed/Substitute/Encore Jumpluff?