I put this set for OU, but I think it can work better for this tier
Sceptile @ Life Orb
Overgrow
252 Attack 232 Speed 24 SP.Attack
Naive/Hasty
Hone Claws
Focus Blast
Leaf Blade
Rock Slide
This is so meh; if you use Overgrow, take into consideration, that you could run Drain Punch instead of Focus Blast and Swords Dance instead of Hone Claw.
Why? Well, we'll obviously like extra recovery to compensate its Life Orb damage, especially without Giga Drain. The main problem, when using this set in OU is Tyranitar, the one who is believed Focus Blast is chosen for.
Focus Blast on Tyranitar (252 HP, 0 SDef, Sandstorm)
316 - 376 = 78.2% - 93.1%
+1 Leaf Blade on Blissey (252 HP, 252 Def+)
390 - 459 = 54.6% - 64.3%
Compared to:
+2 Drain Punch on Tyranitar (252 HP, 0 Def)
588 - 696 = 145.5% - 172.3%
+2 Drain Punch on Blissey (252 HP, 252 Def+, Bold)
578 - 680 = 81% - 95.2% (* btw, that's more than Leaf Blade does)
Unfortunately Sceptile doesn't have anything to abuse with Hone Claw but Rock Slide, Focus Blast and Iron Tail. The last ones are rather weak coverage moves, since Iron Tail has nothing to add to a grass-fighting coverage and Focus Blast doesn't get its job done.
In UU Focus Blast sucks as a filler, too. The only pure physical walls who come to mind are Slowbro and Regirock. Bro resists fighting, so no doubt Leafblade will do more damage than Focus Blast.
+1 Leaf Blade on Slowbro (252 HP, 252 Def+, Bold)
290 - 344 = 73.6% - 87.3%
+2 Leaf Blade on Slowbro (252 HP, 252 Def+, Bold)
390 - 458 = 99% - 116.2%
One stat boost makes the difference: Almost definite 2HKO (almost because of crits) or a close OHKO.
In the case of Regirock:
Focus Blast on Regirock (252 HP, 0 SDef)
238 - 282 = 65.4% - 77.5% (expect less in sandstorm)
+2 Leaf Blade on Regirock (252 HP, 252 Def+, Relaxed)
248 - 294 = 68.1% - 80.8%
In this case better stick to SD.
Conclusion: Focus Blast is a bad filler for physical sweeper, regardless of the tier. I might have written far to much to prove it ...