(M) @ Expert Belt / Life Orb
Ability: Solid Rock
EVs: 56 HP/200 Spd/252 SAtk
Timid nature (+Spd, -Atk)
- Earth Power
- Overheat
- Stealth Rock
- Protect
I've been using this as an anti-lead to great success. Earth Power handles Infernapes, Metagross', and Heatrans, while Overheat handles Bronzong, Jirachi and to a lesser extent Azelfs. I use the Life Orb variant, as lead Infernapes hardly give me any real problems. It also deals massive amounts of damage to other OU threats.
Infernape - First turn, they usually use Fake Out. But use Earth Power just in case. Second turn they'll use Stealth Rock, while you bring them to 1 HP.
Third turn they CC you and you kill it off.
Standard Lead Ape's Fake Out vs. Camerupt
260 Atk vs 176 Def & 295 HP (40 Base Power): 43 - 51 (14.58% - 17.29%)
Standard Lead Ape's Close Combat vs. Camerupt
260 Atk vs 176 Def & 295 HP (120 Base Power): 190 - 225 (64.41% - 76.27%)
225+51 = 276, so even if they score max damage for both attacks, Camerupt still lives. And is able to finish Infernape off. Life orb could potentially lower your HP enough for CC to kill you.
Metagross - Standard Lead Metagross runs 178 speed, neutral/max Camerupt hits 179. So I made Camerupt Timid so I can have a little buffer space. But;
Life Orb Camerupt's Earth Power vs. Standard Lead Metagross
309 Atk vs 216 Def & 364 HP (90 Base Power): 362 - 428 (99.45% - 117.58%)
92% chance to OHKO
It's not a guarenteed OHKO, but they will most likey SR first turn expecting to live off of the Occa Berry.
Heatran - The only one I've ever fought Earth Powered right away, which I lived, and proceeded to OHKO him back through the Shuca berry.
Timid Max SpA Heatran's Earth Power vs. Camerupt
359 Atk vs 186 Def & 295 HP (90 Base Power): 186 - 220 (63.05% - 74.58%)
Camerupt's Earth Power vs. Standard Lead Heatran(Shuca)
309 Atk vs 248 Def & 324 HP (90 Base Power): 314 - 372 (96.91% - 114.81%)
Unfortunately not a guaranteed OHKO, but a decent 79% chance.
Bronzong - You outspeed him and OHKO with Overheat.
Camerupt's Overheat vs. Sassy Max HP/92 SpD Levitate Zong.
309 Atk vs 320 Def & 338 HP (140 Base Power): 378 - 446 (111.83% - 131.95%)
Jirachi - I haven't fought one yet, but all they can really do to you is trick. So Protect first turn, to see what they lock themselves into. And make the appropriate switch or
Camerupt's Overheat vs. Calm MaxHP/MaxSpD Jirachi
309 Atk vs 328 Def & 404 HP (140 Base Power): 368 - 434 (91.09% - 107.43%)
I can't ever imagine running into a +Max/Max Jirachi, so it's pretty safe to assume a OHKO.
Azelf - Overheat while they set up rocks, protect on the obvious explosion. They can't really do anything to you other than explode.
Camerupt is also a great counter for Zapdos, as the only move they commonly carry that isn't resisted damage is Hidden Power Ice/Grass.
Camerupt Overheat vs. Standard MaxHP/MinSpD Zapdos
309 Atk vs 216 Def & 384 HP (140 Base Power): 280 - 331 (72.92% - 86.20%)
87% chance to OHKO after SR damage.
Anyway, I used Life Orb in all my calcs. Any 'Standard' sets can be found on their analysis page. Going modest over timid will guarantee the OHKO on Jirachi, Heatran, and Metagross and will guarentee the OHKO after SR to Zapdos.
Edit: Oh yeah, I forgot. All calcs were done using Libelldra's Damage Calc.