Camerupt

Magma Armor
Cannot be frozen. Halves the amount of steps required to hatch eggs.
Type Tier
Fire / Ground UU
Statistics
Min- Min Max Max+
HP
70
- 281 344 -
Atk
100
212 236 299 328
Def
70
158 176 239 262
SpA
105
221 246 309 339
SpD
75
167 186 249 273
Spe
40
104 116 179 196
Name Item Nature

Standard Camerupt

Choice Band / Leftovers Adamant
Moveset EVs
~ Earthquake
~ Flamethrower / Fire Blast
~ Rock Slide / Hidden Power Rock
~ Explosion
186 HP / 188 Atk / 136 SpA

This set is able to hit a lot of Pokémon hard in the face, but Waters are a big threat. Rock Slide or Hidden Power Rock will hurt Salamence or Gyarados a bit. If Camerupt did its job and the Pokémon it counters are gone, try to get in one more kill with Explosion. Exploding camels are awesome. Using it requires a lot of prediction, and since you're usually going to switch out after attacking, Choice Band is great for some extra power.

Other Options

Body Slam can paralyze Gyarados and Salamence, but it won't help you that much against Waters, and you're helping Milotic with it. Howl because you can't 2HKO Blissey with Earthquake without it, then again I'd just Explode on such a valuable Pokémon. Overheat hurts just a little more than your other Fire moves, if you don't mind the Special Attack drop afterwards. Substitute if you suck at predicting. Toxic is something you should try out: all of your counters are hindered a lot by Toxic, and this is Camerupt's way of opening up the game. Usually you will put one of these in the third slot if you want them, because it's STABed options and Explosion are too powerful to pass up.

EVs

The only stats it needs are HP and both attacking stats. You can go for 320 HP if you want to be able to switch in often on Electrics. For attacking, focus on physical Attack. Circa ~280 Special Attack is enough, if only to kill Gengar with Fire Blast after he has Substituted.

Opinion

Slow, fragile, but exceedingly powerful. One of the safest switch-ins on Weezing and Electrics. It has very common counters, but it can work around them. The trick to using Camerupt is to predict well, and to blow up while you still can.

Counters

If you're using this in standard, you'd find the bulky Waters to be annoying, although, they all fear that Explosion off of Camerupts very respectable attack stat. Salamence and Gyarados are useful switchins, with their immunity to ground and Fire resistance as well as Intimidate. Flygon is also a great switch-in, unless you are facing novelty Hidden Power Ice ones. Claydol pretty much makes Camerupt switch out silently, he is immune to Earthquake and his high Special Defense (possibly with help from Light Screen) makes Fire moves somewhat ineffective, and his STAB Earthquakes hurt Camerupt a lot.

While in Underused, you'll have the same old problems facing the bulky Waters, Blastoise, Politoed, Poliwrath and Walrein. In addition, you'll face some troubles with Solrock and Lunatone. The biggest weakness of Camerupt, however, is just it's horrible speed that allows everything else to hit first and probably harder due to it's bad typing.