http://www.smogon.com/dp/pokemon/camerupt
The main problem with the current Camerupt analysis is that it's completely OU-centric. Camerupt is a UU pokemon and moreover is (nearly) completely outclassed in OU by Heatran, so it's analysis should focus in the environment where it is best suited. I also added in Specs and Rock Polish sets, and merged the physical and special rest-talkers into one set.
[SET]
name: Support
move 1: Lava Plume / Flamethrower
move 2: Earth Power
move 3: Stealth Rock
move 4: Yawn / Explosion / Toxic
item: Leftovers
ability: Solid Rock
nature: Modest
evs: 228 HP / 72 SpA / 208 SpD
[SET COMMENTS]
<p>Camerupt's attempt to support the team. With only STAB moves, fliers that resist Fire such as Mantine and Altaria are free to switch in, so set up Stealth Rock to punish them. The choice of Fire STAB is between power (Flamethrower) and Burn rate (Lava Plume). The final slot is to give Camerupt some additional status inducing ability. Yawn can help to cause switches to rack up Stealth Rock damage or Sleep a counter, and Toxic punishes any bulky Pokemon switching in (as an added bonus, Ground hits Super Effective against both types that are immune to Toxic). Alternatively, just blow up Camerupt when you feel his job is done.</p>
[SET]
name: Choice Band
move 1: Earthquake
move 2: Stone Edge
move 3: Overheat
move 4: Explosion
item: Choice Band
ability: Solid Rock
nature: Brave
evs: 6 HP / 252 Atk / 252 SpA
[SET COMMENTS]
<p>A very slow, but very powerful Choice Bander. Earthquake is obvious for STAB, with Stone Edge to cover Flying types, especially those that resist both your STAB moves. Camerupt lacks a physical Fire attack, so Overheat is your best bet for secondary STAB and hits very hard even without a boost. Explosion destroys anything that isn't resistant or immune.</p>
[SET]
name: Choice Specs
move 1: Earth Power
move 2: Flamethrower / Fire Blast / Overheat
move 3: Hidden Power Ice / Hidden Power Grass
move 4: Explosion
item: Choice Specs
ability: Solid Rock
nature: Quiet
evs: 6 HP / 252 Atk / 252 SpA
[SET COMMENTS]
<p>Another dangerous set against which there are few safe switch-ins. Earth Power and a Fire move are obvious choices, but deciding on a Hidden Power is tricky. Ice ruins Altaria but otherwise has limited use; Grass takes down Quagsire and Gastrodon as well as dealing a hefty amount to Solrock, Lunatone, and most other Water types. Explosion is great as a finishing move. If you wish to use Camerupt in a Trick Room team, Eruption can be placed in the Fire slot.</p>
[SET]
name: Rock Polish
move 1: Rock Polish
move 2: Fire Blast
move 3: Earth Power
move 4: Explosion
item: Leftovers / Life Orb
ability: Solid Rock
nature: Mild
evs: 8 Atk / 252 SpA / 248 Spe
[SET COMMENTS]
<p>Camerupt is slow, but 40 Speed isn't completely unusable. After one Polish the above EV spread gives you just enough speed to outpace Jolly Purugly, and you're free to sweep. Explosion is good for a last gasp, but an Ice or Grass type Hidden Power is worth consideration, as both allow you to OHKO the 4x weak Pokemon that would otherwise wall you.</p>
[SET]
name: Sleep Talk, Physical
move 1: Rest
move 2: Sleep Talk
move 3: Stone Edge
move 4: Earthquake
item: Leftovers / Life Orb
ability: Solid Rock
nature: Adamant
evs: 228 HP / 96 Atk / 184 SpD
[SET COMMENTS]
<p>Its immunity to both Thunder Wave and Will-O-Wisp already made Camerupt a good status absorber, but with this set it can absorb Sleep, too. Stone Edge and Earthquake provide good coverage if you wish go the physical route. Life Orb gives some extra power, but Leftovers is usually the preferred item for a Pokémon you want to stick around for a while. This set makes a great switch into most versions of Ninetales.</p>
[SET]
name: Sleep Talk, Special
move 1: Rest
move 2: Sleep Talk
move 3: Lava Plume
move 4: Earth Power
item: Leftovers / Life Orb
ability: Solid Rock
nature: Modest
evs: 228 HP / 96 SpA / 184 SpD
[SET COMMENTS]
<p>Like the above, except special. Lava Plume helps to grab some Burn support with a nice 30% chance per hit, making Camerupt a further asset. Earth Power covers guys like Heatran and Tyranitar, should you use this in OU, or any of the various Fire and Rock types in UU.</p>
[Other Options]
<p>Roar is a solid option over Yawn on the first set. Sunny Day and Solarbeam are available to allow him to contend with Water types, but his sluggishness prevents him using them to great effect. Will-O-Wisp is always a good status option.</p>
[EVs]
<p>For the Support set, you'll want to focus on HP first. 228 EVs allows for maximum Leftovers recovery. Modest nature, with a little investment in Special Attack and the rest in Special Defense. If by some chance you're using Camerupt in OU, a neutral nature and 96 EVs in Attack allow you to OHKO Blissey with Explosion.</p>
<p>For the Choice Bander, go with a Brave nature and maxed out Attack and Special Attack. Same spread for Choice Specs, but with a Quiet nature instead of Brave. If you're using either set in Trick Room, make sure to set your speed IV to zero.</p>
<p>For Rock Polish, 248 is the highest amount of EVs that allows you to outspeed a specific threat, though only one Pokemon (Purugly) rests at 112 speed. You can to drop it to 240 for base 110 Pokemon (Froslass and Jumpluff), or even 216 for base 105 (Rapidash, Scyther, Electabuzz, Manectric, and Lopunny) if you wish to invest more in Attack. If you're willing to take a drop in power, a speed boosting nature and 236 EVs allow you to beat Jolly Swellow.</p>
<p>Sleep Talk should follow the same spread as the support set. If you're using special attacks, switch to a Modest nature and move the Attack EVs to Special Attack.</p>
[Opinion]
<p>The ability to inflict burns with Lava Plume is a welcome new addition to Camerupt's movepool, as is Earth Power which enables him to use both STABs without the need to split offensive EVs. Solid Rock is a very cool ability and goes some way towards helping Camerupt survive a turn or two longer. Camerupt does fill a few unique niches, such as possessing immunity to both Thunder Wave and Will-O-Wisp and immunity to Electric combined with neutrality to the two Hidden Power types it's most often seen with, but is frequently outclassed by Heatran in OU, who has a greater number of resistances and generally superior stats. In UU Camerupt is far better, and makes a versatile attacker that's difficult to counter thanks to good type coverage and strong attacks on both sides of the spectrum.</p>
[Counters]
<p>Water types generally work well. Mantine is best since it resists both STABs and has massive Special Defense (though sets with Stone Edge should be avoided), but most other UU Water types like Blastoise, Gastrodon, and Quagsire do decently, though they can be worn out after too many Ground attacks.</p>
<p>Altaria is another very good counter, with resistance to both STAB attacks, Natural Cure to remove any status Camerupt may be throwing around, and Earthquake to hit Camerupt hard. Solrock and Lunatone resist both STAB attacks, but the former has poor special defense while the latter often lacks an attack to really threaten Camerupt. Grumpig's Thick Fat and abundant Special Defense let it take Camerupt with ease.</p>
<p>In OU play, Blissey walls any purely special set with ease, though Explosion should be avoided. Cresselia walls Camerupt almost as well as Blissey and can take an Explosion without fainting instantly. Gyarados and Salamence fear status and Stone Edge but otherwise make fairly safe switches. Milotic walls most sets easily and doesn't mind Burns nearly as much thanks to Marvel Scale, and most other bulky Water Pokemon like Suicune and Swampert do the job as well.</p>
The main problem with the current Camerupt analysis is that it's completely OU-centric. Camerupt is a UU pokemon and moreover is (nearly) completely outclassed in OU by Heatran, so it's analysis should focus in the environment where it is best suited. I also added in Specs and Rock Polish sets, and merged the physical and special rest-talkers into one set.
[SET]
name: Support
move 1: Lava Plume / Flamethrower
move 2: Earth Power
move 3: Stealth Rock
move 4: Yawn / Explosion / Toxic
item: Leftovers
ability: Solid Rock
nature: Modest
evs: 228 HP / 72 SpA / 208 SpD
[SET COMMENTS]
<p>Camerupt's attempt to support the team. With only STAB moves, fliers that resist Fire such as Mantine and Altaria are free to switch in, so set up Stealth Rock to punish them. The choice of Fire STAB is between power (Flamethrower) and Burn rate (Lava Plume). The final slot is to give Camerupt some additional status inducing ability. Yawn can help to cause switches to rack up Stealth Rock damage or Sleep a counter, and Toxic punishes any bulky Pokemon switching in (as an added bonus, Ground hits Super Effective against both types that are immune to Toxic). Alternatively, just blow up Camerupt when you feel his job is done.</p>
[SET]
name: Choice Band
move 1: Earthquake
move 2: Stone Edge
move 3: Overheat
move 4: Explosion
item: Choice Band
ability: Solid Rock
nature: Brave
evs: 6 HP / 252 Atk / 252 SpA
[SET COMMENTS]
<p>A very slow, but very powerful Choice Bander. Earthquake is obvious for STAB, with Stone Edge to cover Flying types, especially those that resist both your STAB moves. Camerupt lacks a physical Fire attack, so Overheat is your best bet for secondary STAB and hits very hard even without a boost. Explosion destroys anything that isn't resistant or immune.</p>
[SET]
name: Choice Specs
move 1: Earth Power
move 2: Flamethrower / Fire Blast / Overheat
move 3: Hidden Power Ice / Hidden Power Grass
move 4: Explosion
item: Choice Specs
ability: Solid Rock
nature: Quiet
evs: 6 HP / 252 Atk / 252 SpA
[SET COMMENTS]
<p>Another dangerous set against which there are few safe switch-ins. Earth Power and a Fire move are obvious choices, but deciding on a Hidden Power is tricky. Ice ruins Altaria but otherwise has limited use; Grass takes down Quagsire and Gastrodon as well as dealing a hefty amount to Solrock, Lunatone, and most other Water types. Explosion is great as a finishing move. If you wish to use Camerupt in a Trick Room team, Eruption can be placed in the Fire slot.</p>
[SET]
name: Rock Polish
move 1: Rock Polish
move 2: Fire Blast
move 3: Earth Power
move 4: Explosion
item: Leftovers / Life Orb
ability: Solid Rock
nature: Mild
evs: 8 Atk / 252 SpA / 248 Spe
[SET COMMENTS]
<p>Camerupt is slow, but 40 Speed isn't completely unusable. After one Polish the above EV spread gives you just enough speed to outpace Jolly Purugly, and you're free to sweep. Explosion is good for a last gasp, but an Ice or Grass type Hidden Power is worth consideration, as both allow you to OHKO the 4x weak Pokemon that would otherwise wall you.</p>
[SET]
name: Sleep Talk, Physical
move 1: Rest
move 2: Sleep Talk
move 3: Stone Edge
move 4: Earthquake
item: Leftovers / Life Orb
ability: Solid Rock
nature: Adamant
evs: 228 HP / 96 Atk / 184 SpD
[SET COMMENTS]
<p>Its immunity to both Thunder Wave and Will-O-Wisp already made Camerupt a good status absorber, but with this set it can absorb Sleep, too. Stone Edge and Earthquake provide good coverage if you wish go the physical route. Life Orb gives some extra power, but Leftovers is usually the preferred item for a Pokémon you want to stick around for a while. This set makes a great switch into most versions of Ninetales.</p>
[SET]
name: Sleep Talk, Special
move 1: Rest
move 2: Sleep Talk
move 3: Lava Plume
move 4: Earth Power
item: Leftovers / Life Orb
ability: Solid Rock
nature: Modest
evs: 228 HP / 96 SpA / 184 SpD
[SET COMMENTS]
<p>Like the above, except special. Lava Plume helps to grab some Burn support with a nice 30% chance per hit, making Camerupt a further asset. Earth Power covers guys like Heatran and Tyranitar, should you use this in OU, or any of the various Fire and Rock types in UU.</p>
[Other Options]
<p>Roar is a solid option over Yawn on the first set. Sunny Day and Solarbeam are available to allow him to contend with Water types, but his sluggishness prevents him using them to great effect. Will-O-Wisp is always a good status option.</p>
[EVs]
<p>For the Support set, you'll want to focus on HP first. 228 EVs allows for maximum Leftovers recovery. Modest nature, with a little investment in Special Attack and the rest in Special Defense. If by some chance you're using Camerupt in OU, a neutral nature and 96 EVs in Attack allow you to OHKO Blissey with Explosion.</p>
<p>For the Choice Bander, go with a Brave nature and maxed out Attack and Special Attack. Same spread for Choice Specs, but with a Quiet nature instead of Brave. If you're using either set in Trick Room, make sure to set your speed IV to zero.</p>
<p>For Rock Polish, 248 is the highest amount of EVs that allows you to outspeed a specific threat, though only one Pokemon (Purugly) rests at 112 speed. You can to drop it to 240 for base 110 Pokemon (Froslass and Jumpluff), or even 216 for base 105 (Rapidash, Scyther, Electabuzz, Manectric, and Lopunny) if you wish to invest more in Attack. If you're willing to take a drop in power, a speed boosting nature and 236 EVs allow you to beat Jolly Swellow.</p>
<p>Sleep Talk should follow the same spread as the support set. If you're using special attacks, switch to a Modest nature and move the Attack EVs to Special Attack.</p>
[Opinion]
<p>The ability to inflict burns with Lava Plume is a welcome new addition to Camerupt's movepool, as is Earth Power which enables him to use both STABs without the need to split offensive EVs. Solid Rock is a very cool ability and goes some way towards helping Camerupt survive a turn or two longer. Camerupt does fill a few unique niches, such as possessing immunity to both Thunder Wave and Will-O-Wisp and immunity to Electric combined with neutrality to the two Hidden Power types it's most often seen with, but is frequently outclassed by Heatran in OU, who has a greater number of resistances and generally superior stats. In UU Camerupt is far better, and makes a versatile attacker that's difficult to counter thanks to good type coverage and strong attacks on both sides of the spectrum.</p>
[Counters]
<p>Water types generally work well. Mantine is best since it resists both STABs and has massive Special Defense (though sets with Stone Edge should be avoided), but most other UU Water types like Blastoise, Gastrodon, and Quagsire do decently, though they can be worn out after too many Ground attacks.</p>
<p>Altaria is another very good counter, with resistance to both STAB attacks, Natural Cure to remove any status Camerupt may be throwing around, and Earthquake to hit Camerupt hard. Solrock and Lunatone resist both STAB attacks, but the former has poor special defense while the latter often lacks an attack to really threaten Camerupt. Grumpig's Thick Fat and abundant Special Defense let it take Camerupt with ease.</p>
<p>In OU play, Blissey walls any purely special set with ease, though Explosion should be avoided. Cresselia walls Camerupt almost as well as Blissey and can take an Explosion without fainting instantly. Gyarados and Salamence fear status and Stone Edge but otherwise make fairly safe switches. Milotic walls most sets easily and doesn't mind Burns nearly as much thanks to Marvel Scale, and most other bulky Water Pokemon like Suicune and Swampert do the job as well.</p>
