Camerupt isn't even good in trick room tbh. It simply doesn't have the power behind its moves to nab those 1hkos on all but frail offensive mons. Its limited coverage sometimes prevents even 2hkos on typical offense members.
252+ SpA Sheer Force Camerupt Fire Blast vs. 0 HP / 4 SpD Latias: 110-130 (36.5 - 43.1%) -- guaranteed 3HKO
252+ SpA Sheer Force Camerupt Ancient Power vs. 0 HP / 0 SpD Multiscale Dragonite: 102-120 (31.5 - 37.1%) -- 83% chance to 3HKO
252+ SpA Sheer Force Camerupt Earth Power vs. 16 HP / 240 SpD Assault Vest Azumarill: 141-166 (40.8 - 48.1%) -- guaranteed 3HKO
252+ SpA Sheer Force Camerupt Fire Blast vs. 4 HP / 0 SpD Latios: 128-151 (42.3 - 50%) -- 0.4% chance to 2HKO
252+ SpA Sheer Force Camerupt Fire Blast vs. 252 HP / 0 SpD Rotom-W: 131-155 (43 - 50.9%) -- guaranteed 3HKO after Leftovers recovery
These calcs are pretty biased, lacking rocks and all. The worst part is, 2 of them are defoggers, so we can safely assume rocks will be on the field a lot of the time when they come on. Let's look at some more realistic calcs.
Not even bothering with Multiscale Dragonite, calcing against that thing just isn't fair for calcing vs "offensive Pokemon", and Latias is a 3HKO.
252+ SpA Sheer Force Camerupt Earth Power vs. 240 HP / 16 SpD (this is the superior spread) Assault Vest Azumarill: 178-211 (44.3 - 52.6%) -- guaranteed 2HKO after Stealth Rock
252+ SpA Sheer Force Camerupt Fire Blast vs. 4 HP / 0 SpD Latios: 128-151 (42.3 - 50%) -- 90.6% chance to 2HKO after Stealth Rock
252+ SpA Sheer Force Camerupt Fire Blast vs. 252 HP / 0 SpD Rotom-W: 131-155 (43 - 50.9%) -- 55.5% chance to 2HKO after Stealth Rock and Leftovers recovery
Yeah, and remember, these are RESISTS on typical offensive teams. Since we're calcing assuming Cam is in TR and we're facing offensive teams, I think a calc like THIS is more in order.
252+ SpA Sheer Force Camerupt Fire Blast vs. 0 HP / 0 SpD Landorus-T: 334-394 (104.7 - 123.5%) -- guaranteed OHKO
Hyper Offensive Pokemon normally have bulk similar to Lando-T's, and here we can clearly see that it would be OHKed under TR. Sorry, but it really does do a lot to typical offensive Pokemon.
Let us also remember that camerupt operates off of prediction. It can't outspeed anything, so hitting on the switch is all that it has to offer against any offensive teams. A misused ancientpower/earth power will waste one of the limited switchins that camerupt has throughout the match.
We've always negatively addressed a prediction argument. Keep in mind that since a lot of the switch-ins for this thing will be free, as that's the best time to even bring it in, and when they aren't, you can't exactly say "opponent can predict hahaha" because prediction works both ways. It might rely on it, but that won't massively effect it's viability.
Also, I don't get the trend of posting mediocre calcs and trying to use them to prove camerupt's worth. Sure, it has the potential to 2hko phys defensive rotom-w/azumaril/other resisted mons, but it will never actually GET the 2hko, because it is outsped by everything. Sure, you can speed creep for things like slowbro, but that cuts into its bulk, and it has the potential to be unreliable. Meanwhile, there are mons that can perform this role significantly better than camerupt:
252+ SpA Sheer Force Camerupt Fire Blast vs. 252 HP / 4 SpD Eviolite Porygon2: 193-228 (51.6 - 60.9%) -- guaranteed 2HKO
252 SpA Mega Charizard Y Fire Blast vs. 252 HP / 4 SpD Eviolite Porygon2 in Sun: 219-258 (58.5 - 68.9%) -- guaranteed 2HKO
TIMID Char-Y is not only stronger. It also carries better coverage (solarbeam, can use eq for tran if so desired, dragon moves for latis if desired, etc.) and can support the team/itself via sun (also useful for revenging something like rush exca)
And now it's time for the show: All the reasons why Mega Camerupt has niches over Mega Charizard Y! Thank you!
1) Mega Camerupt takes neutral from rocks. This is a big plus already.
2) Mega Camerupt has the better typing overall.
3) Mega Camerupt doesn't set sun as it's reliance on power; it can't be protect stalled or anything like that vs stall teams because it's power source doesn't run dry. This also doesn't mean the awkward scenario of Keldeo being out in the sun doesn't happen.
4) MCam is more suited to balanced teams anyway.
I think these are pretty viable niches, and rule out some argument that "Char Y is 100% better than MCam".
252 SpA Life Orb Sheer Force Landorus Earth Power vs. 252 HP / 4 SpD Eviolite Porygon2: 160-188 (42.7 - 50.2%) -- 1.6% chance to 2HKO
Landorus carries a naturally weaker primary stab. It's coverage options, though, are also superior. It has access to u-turn, can outspeed things (is therefore useful against stall/balance), has better typing (weak to ice shard, but camerupt is outsped by slowbro... no priority neccesary to 1hko), and it doesn't take up a mega.
Why are you now bringing up bad moves on good Pokemon to support your argument? U-Turn Lando-I is just a waste of a moveslot. Anyway, Cam has niches over this thing as well. Less switch-ins on stall, better typing, ext.
252 SpA Pixilate Mega Gardevoir Hyper Voice vs. 252 HP / 4 SpD Eviolite Porygon2: 160-189 (42.7 - 50.5%) -- 1.2% chance to 2HKO
Again, power comparable to Mega-Camperupt, except it has far better coverage, and outspeeds things.
Power comparable to MegaCam? I won't deny that this thing is probably a superior stallbreaker, but this thing has under a 2% chance to 2HKO Porygon2. MegaCam had a guaranteed chance. JS. And again, MCam has a niche over this thing, too: lack of switch ins on stall. Things like Jirachi actually give MGarde a hard time, but of course this doesn't apply to MCam.
252+ SpA Choice Specs Exploud Boomburst vs. 252 HP / 4 SpD Eviolite Porygon2: 205-243 (54.8 - 64.9%) -- guaranteed 2HKO
If you really want to go there, I would honestly rather use exploud. It is stronger, and it has the single most spammable stab move in the game. Also, it outspeeds stuff. Better on tr because of not needing to predict; just bop. Lacks defensive synergy and the like, but camerupt's is far overstated anyway.
It's coverage also sucks, is locked into one move, never switches in safely unlike MCam, has a ton of switches on stall, ext. Don't even try to argue that this thing is more viable than MegaCam, that's just bs.
Head to the physical end of the spectrum, and camerupt finds even more competition (turn up, crawdaunt). On the topic of its bulk, it's very over-exaggerated. Its typing grants it a single immunity, and that immunity is usually paired with one of its 4x weaknesses, via one of the most effective momentum-grabbers in the meta. It is weak to common mons that are very dangerous and hard to switch into: Azumarill, Keldeo, Greninja, Landorus, Latis, Manaphy are a few. This list grows even larger if camerupt is weakened a bit. Given that it is vulnerable to all hazards, and has zero recovery, this isn't an unlikely scenario. It is 1/2hkod by most of the meta, giving it perhaps one or two switches to take advantage of its "unique defensive typing." Yes, it can be brought in on a u-turn, but it then has to tank a hit from literally any mon that is in play due to its horrid speed.
WHY ARE WE USING IT'S PHYSICAL SIDE TO RANK IT'S VIABILITY WHEN IT'S ONLY VIABLE SET IS THE SPECIAL ONE.
Apart from that, a lot of this is actually true, so I'll give you that at least. Yeah, it has a lot of flaws, but you once again just ignore all the positives. That immunity is not just handy vs Rotom-W. Mega Mane, Thundurus, ext all dislike it having that. MCam on balanced also works as an effective counter to the occasional balanced mon. These include titans like Clefable, freaking Clefable. I'd say MCam's typing is pretty sweet, even if it is flawed in a couple aspects. Victini, a Pokemon with a similar job, also loses to mostly everything on that list of yours, has zero recovery, is even more vulnerable to hazards, doesn't have an electric immunity, ext. That thing is B+, because it has numerous positive traits such as being really hard to switch into ext. These are positives that MCam shares with it, and both of them have niches over each other. Now, of course, due to the opportunity cost caused for being Mega Pokemon, MCam should be lower, but not as low as you make out, and this is why I think it's B/B-.
After initial postings about it, I thought that it would be better, but after actually using it, even it a TR environment, I think that it should go down to C-ish
Tell me how any of that amounts to C- when it's flaws and positive traits are very similar to Victini's, who's much higher. I know Victini is a lot faster, but MCam isn't weak to SR. For every positive trait one of them has, the other one has a niche over it, putting them level at viability terms... if MCam wasn't a mega. It is, so I reckon it should be 2 subranks lower at best, which is a healthy B- rank.