I spend a considerable amount of time thinking of new ways to use Pokemon as leads to simply combat the common leads that run rampant throughout the tier. My first thought is generally that it needs to be something with a somewhat descent speed to combat the likes of Azelf and Aerodactyl, but also have a considerable attack stat to at least lay some hit-and-run damage from U-Turn. After much deliberation and searching all throughout the Pokedex I found it, a somewhat humble Pokemon stuck in BL, Staraptor. The deeper I looked into It's movepool, though shallow, It's actually somewhat specialized and almost seems like a perfect Anti-Lead for the current metagame.
Staraptor @ Focus Sash
Ability: Intimidate
Nature: Lonely
4 HP/ 252 Atk/ 252 Spe
-U-Turn
-Endeavor
-Quick Attack
-Protect
Since so many leads are either faster than me or use priority, such as Bullet Punch, I thought I'd cut them down to size with a very simple strategy...
Endeavor/Quick Attack
The Lonely nature is to get the most out of Staraptor's Endeavor and if nothing else it will render their Focus Sash useless in return, though I may switch Quick Attack for Pursuit, but since I haven't had a chance to playtest this set yet we'll see. Protect is basically thrown in as a filler and helps feel-out the opponents moveset. Azelf can be OHKO'd by U-Turn or 2HKO'd by a Quick Attack, U-Turn combo, considering most Azelf will be carrying Focus Sash, making TrickZelf's so rare that there really need be no worry.
Swampert @ Leftovers
Ability: Torrent
Nature: Relaxed
252 HP/ 4 Atk/ 252 Def
-Stealth Rock
-Earthquake
-Ice Beam
-Protect
This Swampert is very standard, but it does what It's supposed to, and It does it well. Basically used to set up Stealth Rocks and scout out some of the opponent's movesets with protect. Pretty self-explanatory.
Scizor @ Choice Band
Ability: Technician
Nature: Adamant
248 HP/ 252 Atk/ 8 Spe
-U-Turn
-Bullet Punch
-Superpower
-Pursuit
With Swampert's disposition to grass Scizor is the perfect switch in, hitting OU's most common grass type Celebi with U-Turn or Pursuit. But It doesn't only function as a switch in for Swampert, It's my resident sweeper, there's a reason that Scizor is the OU of OU.
Heatran @ Expert Belt
Ability: Flash Fire
Nature: Naive
4 Atk/ 252 SpA/ 252 Spe
-Fire Blast
-Earth Power
-Hidden Power (Electric)
-Explosion
Heatran and Scizor go together like peanut butter and jelly, Heatran absorbs fire damage aimed at Scizor and generally gets to revenge kill it. It's set up to potentially bluff a Choice Scarf so that I can pull some surprise OHKO's, on the opponent's Poke's. It also rounds off the coverage.
Celebi @ Leftovers
Ability: Natural Cure
Nature: Bold
252 HP/ 220 Def/ 36 Spe
-Thunder Wave
-Grass Knot
-Recover
-Hidden Power (Ice)
Celebi helps slow down the opponent with Thunder Wave to allow Heatran to take down Pokemon that would normally outspeed it. It also helps out when dealing with Gyarados and opposing Swampert.
Blissey @ Leftovers
Ability: Natural Cure
Nature: Calm
24 HP/ 252 Def/ 232 SpD
-Wish
-Protect
-Seismic Toss
-Toxic
Standard Blissey, I generally have one on my team they seem to do what they are designed for and that is wall so, I dunno. I don't really care if someone else figures something else better to use than I'll probably switch it. But for now Blissey is here to stay.