I had actually been considering mentioning a couple of those, regarding proof of Orichalcos's effects. My internet went about for about 45 minutes, though.
In any case, during the city's occupation by the Orichalcos, Obnoxious Celtic Guardian was able to defeat at least 1 Orichalcos Soldier.
Maybe of note is OCG also took hits from Orichalcos Giygas when Atem "dueled" the Orichalcos Soldier in the Valley of Souls. Admittedly, a very physical duel, since Giygas broke the ground repeatedly, & spirits had to shield Atem from its attack -I hate those spirits for denying us a chance at a durability feat- as well as I believe, empower his deck so he could fight back properly? Seal was also present there, thanks to Dartz.
Interestingly, if I'm reading the Wiki right, Rocket Hermos Cannon is effectively a rocket launcher, & caused knockback -Joey actually was sent flying to the barrier at the outer area of the Seal's ring- & visible battle damage to the victim both times it was used, & had enough heat to leave Joey smoking.
Pretty sure Big Bang Dragon Blow is the one causing the feat in your screenshot there, Rapid.
Of course, the slight problem is these MIGHT only apply to Joey with equipment that he needs Hermos to summon. And more than that, like how Yugi & Kaiba were summoning Timaeus & Critias to fight off Orichalcos Soldiers, the dragons had physicality & their own feats in the real world.
Ergo, the AP from such collission feats is not only from Joey, & Valon's armored clashes, but likely a lot of it may be coming from the Hermos Equipment Joey has on.
Thankfully, even if we do want to chalk up a lot of the AP of those feats to Hermos, there is at least 1 feat from that duel that doesn't involve equipment formed from that dragon.
When Joey uses Lord of the Red & collides with Valon's Buster Pile, it creates an explosion of considerable size.
https://youtu.be/v08kNNI94E8?t=17m34s (I swear, if I knew of other sources of proper speed & resolution on Youtube, which is well known to be safe & accessible, I'd use 'em. But it's not like everyone trusts the other sites....)
Anyway, unfortunately, if the monsters are real.... Well, Joey used Red Eyes Black Dragon -it hadn't been summoned that duel, though, IIRC- to turn himself into Lord of the Red (As well as Aura Armor.) so it might also be dependent on them. If REBD has any feats....
At the very least though, both Joey & Valon may have the durability for surviving the feats, & at least Rocket Hermos Cannon. Valon also has at least enough AP with Burning Knuckle to damage Joey immediately before Joey's Aura Armor was shown being on him.
Do they have any feats of damaging each other without their equipment on? Should we assume they can scale to one another's equipped statistics?