Not as much as guarantee as you'd expect.
252 SpA Archaludon Flash Cannon vs. 248 HP / 0 SpD Iron Valiant: 386-456 (109.9 - 129.9%) -- guaranteed OHKO
This has to get disabled, and thus
+1 252 SpA Archaludon Electro Shot vs. 248 HP / 0 SpD Iron Valiant: 312-368 (88.8 - 104.8%) -- 31.3% chance to OHKO on the disable turn.
If you don't OHKO, your Rock Tomb can sometimes kill, and a smart Valiant goes for Moonblast to pick up the 2HKO if it doesn't completely foregoing encore.
0 SpA Iron Valiant Moonblast vs. 0 HP / 0 SpD Archaludon: 169-201 (52.6 - 62.6%) -- guaranteed 2HKO
If you had electro t1 you get encored and disabled before you fire off a beam, so don't do that!
Custap actually loses here, because you can't endure the second moonblast because if you endure you get encored
Specs loses (This set is so bad guys, why does it have 10% usage), because of Disable.
Stamina AV is a bit interesting, because Moonblast drops to a 4HKO with investment meaning, if you have a good coverage move you can probably win.
Kinda weird. If Stall Pecha is max speed (not like a crazy thing to say), it can use parting shot and recover and stall out Arch and make it die, but if it's slower it gets 2HKO'd, unless it invests
and has a healing item then it doesn't
+1 252 SpA Archaludon Electro Shot vs. 252 HP / 0 SpD Pecharunt: 230-271 (60.5 - 71.3%) -- guaranteed 2HKO
(Neutral Draco Meteor does the same)
+1 252 SpA Archaludon Electro Shot vs. 252 HP / 252 SpD Pecharunt: 177-209 (46.5 - 55%) -- 66.4% chance to 2HKO
Every other Arch should also lose.
Not so straightforward as you'd might expect (or maybe you do expect it because so many of these are not straightforward)
+1 252 SpA Archaludon Electro Shot vs. 0 HP / 4 SpD Porygon-Z: 260-307 (83.6 - 98.7%) -- guaranteed 2HKO
This doesn't kill, meaning Arch needs to rock tomb first to beat Uproar from Specs
252 SpA Choice Specs Adaptability Porygon-Z Uproar vs. 0 HP / 0 SpD Archaludon: 215-253 (66.9 - 78.8%) -- guaranteed 2HKO
(or ice beam or dark pulse)
But if you do that vs Scarf you still don't necessarily outspeed and Uproar still has a chance of 2HKOing
252 SpA Adaptability Porygon-Z Uproar vs. 0 HP / 0 SpD Archaludon: 144-170 (44.8 - 52.9%) -- 28.1% chance to 2HKO
And then what about vs Custap? Then you're 50/50 after dark pulse or ice beam t1 doing non boosted damage (they could be scarf still!) and do you predict the Endure > Hyper Beam and Rock Tomb again or do you go for the KO?
And what if they've just Trick their choice item on to you T1?? Now you're locked into Rock Tomb as they do Coverage > Hyper Beam
Custap Arch does a little better as it can just Draco t1 and set read a little bit better Endure appropriately and win. Stamina AV dummies, obviously.
Why must I suffer with intricacies in what should be a simple match-up?
Arch is bulkable for Raging Bolt, and thanks to Thunderclap can have priority to pick up a 2HKO (I just chose 100
252 SpA Archaludon Draco Meteor vs. 248 HP / 164 SpD Raging Bolt: 384-452 (84.7 - 99.7%) -- guaranteed 2HKO
96+ SpA Protosynthesis Raging Bolt Dragon Pulse vs. 0 HP / 0 SpD Archaludon: 262-310 (81.6 - 96.5%) -- guaranteed 2HKO
96+ SpA Protosynthesis Raging Bolt Thunderclap vs. 0 HP / 0 SpD Archaludon: 108-127 (33.6 - 39.5%) -- guaranteed 3HKO
Custap isn't saving you here either, although Stamina AV predictably will.
What set you running bud? Unaware Dirge has a bad time because it's getting hit by Draco's that just won't stop. But most Skeledirge's are Custap, and Skeledirge CAN bulk Meteor Beam, meaning with some investment they can Torch on 1 without fear and Blast Burn on 2 for the 2HKO
+1 252 SpA Archaludon Meteor Beam vs. 248 HP / 252+ SpD Skeledirge: 330-390 (80.2 - 94.8%) -- guaranteed 2HKO
0 SpA Skeledirge Torch Song vs. 0 HP / 0 SpD Archaludon: 133-157 (41.4 - 48.9%) -- guaranteed 3HKO
0 SpA Skeledirge Blast Burn vs. 0 HP / 0 SpD Archaludon: 249-294 (77.5 - 91.5%) -- guaranteed 2HKO
(I didn't feel like figuring out the actual benchmarks)
Custap Arch can pick up a win vs uninvested Skeledirge, but Draco Meteor doesn't really have the necessary power to really win vs any amount of investment
252 SpA Archaludon Draco Meteor vs. 248 HP / 0 SpD Skeledirge: 262-309 (63.7 - 75.1%) -- guaranteed 2HKO
This is out of custap range and can most of the time 2HKO post drop so Skeledirge has to Endure here, but then Arch can endure the following turn and get the win that way.
252 SpA Archaludon Draco Meteor vs. 248 HP / 100 SpD Skeledirge: 231-273 (56.2 - 66.4%) -- guaranteed 2HKO
Avoids this issue as draco no longer 2HKOs and Skeledirge can just Torch> Torch no worries.
0+ SpA Skeledirge Torch Song vs. 0 HP / 0 SpD Archaludon: 145-172 (45.1 - 53.5%) -- 38.7% chance to 2HKO
+1 0+ SpA Skeledirge Torch Song vs. 0 HP / 0 SpD Archaludon: 219-258 (68.2 - 80.3%) -- guaranteed 2HKO
As for Stamina AV, you're still getting got by Torch Song > Blast Burn.
I didn't believe this calc when I saw it, but it's right.
252 SpA Archaludon Flash Cannon vs. 248 HP / 0 SpD Sylveon: 204-242 (51.9 - 61.5%) -- guaranteed 2HKO
Sylveon doesn't need to endure t1 meaning it can Hyper Voice > Endure > Custap to win.
84 SpA Pixilate Sylveon Hyper Voice vs. 0 HP / 4 SpD Archaludon: 193-228 (60.1 - 71%) -- guaranteed 2HKO
Of course, Arch's on Custap Set can take care of that issue, although Sylveon can run Quick Attack, although I believe that is rare nowadays.
Stamina AV also loses as Hyper Voice > Endure > Hyper Beam should KO most of the time with investment.
252+ SpA Pixilate Sylveon Hyper Voice vs. 240 HP / 76 SpD Assault Vest Archaludon: 147-174 (38.5 - 45.6%) -- guaranteed 3HKO
252+ SpA Pixilate Sylveon Hyper Beam vs. 240 HP / 76 SpD Assault Vest Archaludon: 246-289 (64.5 - 75.8%) -- guaranteed 2HKO