ethan06 I see a lot more defensive answers for clawitzer than only chansey-line. Assault vest azumarril, Florges, sylveon, assaultvest goodra - note that even mega launcher boosted choice specs max invested dragon pulse does not get the 2hko on goodra -
252+ SpA Choice Specs Mega Launcher Clawitzer Dragon Pulse vs. 252 HP / 252+ SpD Assault Vest Goodra: 82-98 (41.6 - 49.7%) -- guaranteed 3HKO
assaultvest conkeldurr, mega ampharos checks it too. I dont see it being as good as reuniclus, whimsicott and other B- Pokemon. It gets locked into one move wich you can scout for and it gets koed too quickly and is not enough for me for that level. I see it more being in C, but not higher.
I agree with you that these are checks, but with the exception of Conk, AV Azu and Sylveon, none of these are commonly seen. None of the Fairies appreciate repeated Sludge Bombs, especially if you get the Poison, and I've never seen a Florges, a Goodra nor a Mega Ampharos in Battle Spot, and I've been playing for a long time... If Clawitzer could bust through everything in the game then I'm sure it'd be a lot higher than B-, but as it is, it can put huge holes in the common defensive behemoths of the format and get OHKOs on some of the offensive ones, similar to how Whimsicott (which is in B btw) can only disrupt certain things, or how Reuniclus is all fun and games until you run into Aegislash or a defensive Psychic.
About scouting and locking - Consider that in Battle Spot Singles, the opponent will only ever have two switch-ins as opposed to five. Even if you don't know what they are yet, it's very easy to check things off the list as they appear. Now while this doesn't really apply to things like Choice Band Mamoswine, which, while powerful, has solid checks to each of its STABs in Pokémon like Heatran, Azumarill and Landorus-T, Clawitzer's coverage is far more neutral, and a Choice Specs Dark Pulse (for instance) is capable of taking huge chunks out of a large portion of the format - Pokémon like Fighting types and Fairy types can easily be caught on the switch-in with a Sludge Bomb or a STAB Scald if you have a picture of the team in front of you. Being KOed too quickly isn't that much of an issue when you've likely taken out one or two of the opponent's Pokémon yourself. It's certainly at least as good as Mega Blastoise, which is currently in B-, if not better - definitely not as bad as Vaporeon and Pidgeot.
e:
252+ SpA Choice Specs Clawitzer Sludge Bomb vs. 228 HP / 12 SpD Assault Vest Azumarill: 126-150 (61.7 - 73.5%) -- guaranteed 2HKO
252+ Atk Huge Power Azumarill Play Rough vs. 252 HP / 0 Def Clawitzer: 106-126 (59.5 - 70.7%) -- guaranteed 2HKO
Clawitzer outspeeds; not a check
252+ SpA Choice Specs Clawitzer Sludge Bomb vs. 252 HP / 4 SpD Sylveon: 128-152 (63.3 - 75.2%) -- guaranteed 2HKO
252+ SpA Choice Specs Pixilate Sylveon Hyper Voice vs. 252 HP / 0 SpD Clawitzer: 162-192 (91 - 107.8%) -- 50% chance to OHKO
it's a roll, but Clawitzer only needs 12 Spe EVs to creep 0 Spe Modest Sylveon, and it can't switch in
252+ SpA Choice Specs Clawitzer Scald vs. 252 HP / 4 SpD Assault Vest Conkeldurr: 100-118 (47.1 - 55.6%) -- 75.4% chance to 2HKO
252+ Atk Guts Conkeldurr Mach Punch vs. 252 HP / 0 Def Clawitzer: 67-79 (37.6 - 44.3%) -- guaranteed 3HKO
can't switch in, and Guts Mach Punch can't 2HKO. No point in staying in on it though so I'll give you that
252+ SpA Choice Specs Clawitzer Sludge Bomb vs. 244 HP / 44+ SpD Florges: 98-116 (53.2 - 63%) -- guaranteed 2HKO after Leftovers recovery
52 SpA Florges Moonblast vs. 252 HP / 0 SpD Clawitzer: 69-82 (38.7 - 46%) -- guaranteed 3HKO
just took the nugget bridge spread for this, who even runs Florges O.o anyways, Florges can't check, especially if you get the poison. Giga Drain wins if you don't poison but lol Giga Drain Florges