Let me throw in my two cents about Tough Claws Honchkrow:
It is the single most broken Theorymon I've seen. Ever.
Sure, it's bulk is meh, but if you invest into attack anyway, you have a seriously overpowered threat on your hands:
252+ Atk Life Orb Tough Claws Honchkrow Sucker Punch vs. 252 HP / 0 Def Aegislash-Shield: 338-400 (104.3 - 123.4%) -- guaranteed OHKO
Let's compare that to a BellyJet Azumarill...
+6 252+ Atk Huge Power Azumarill Aqua Jet vs. 252 HP / 0 Def Aegislash-Shield: 223-264 (68.8 - 81.4%) -- guaranteed 2HKO after Leftovers recovery
DAMN. That's AFTER a Belly Drum
Of course you're saying "But Hclegend, it's super effective! It does double damage! So of COURSE it's going to outdamage a Azumarill!"
True, so let's compare it to a Mega Aggron...
+6 252+ Atk Huge Power Azumarill Aqua Jet vs. 252 HP / 0 Def Mega Aggron: 153-180 (44.4 - 52.3%) -- 16% chance to 2HKO
252+ Atk Life Orb Tough Claws Honchkrow Sucker Punch vs. 252 HP / 0 Def Mega Aggron: 114-136 (33.1 - 39.5%) -- 100% chance to 3HKO
Okay, it's quite a bit less damage. But remember: Azumarill used HALF IT'S HP in order to QUADUPLE it's damage. It's all well and good comparing Honchkrow to one of OUs finest threats, but what about a fellow Sucker Puncher?
252+ Atk Life Orb Bisharp Sucker Punch vs. 252 HP / 0 Def Mega Aggron: 87-103 (25.2 - 29.9%) -- guaranteed 4HKO
Yeah, THAT'S pretty badass. When one of the most powerful OU threats is outdamaged by this, it's pretty damn powerful (And remember, this is MEGA AGGRON. Base 230 DEFENCE! So in reality, the difference is bigger, I just wanted to point this out)
Of course, you might be saying "But Hclegend, how do you think its overpowered if it barely outdamages Bisharp?" Easy. It doesn't just give competition to Bisharp, but both Talonflame and Staraptor!
252 Atk Choice Band Talonflame Brave Bird vs. 252 HP / 4 Def Mew: 213-252 (52.7 - 62.3%) -- 99.6% chance to 2HKO after Leftovers recovery
252 Atk Reckless Staraptor Brave Bird vs. 252 HP / 4 Def Mew: 222-262 (54.9 - 64.8%) -- guaranteed 2HKO after Leftovers recovery
(Well, would you look at that? Scarf Raptor outdamages BANDED Talonflame! Learn something new everyday)
252+ Atk Life Orb Tough Claws Honchkrow Brave Bird vs. 252 HP / 4 Def Mew: 363-426 (89.8 - 105.4%) -- 37.5% chance to OHKO
Holy. Shit. On. A. Stick. Do you see why I think it's overpowered NOW? Okay, so it's Bisharp mixed with Staraptor with around 1.3x more damage AND the ability to switch moves!
Of course, it's not TOTALLY overpowerd, Base 71 speed is pretty slow (Sucker Punch makes up for it somewhat) and its 100/52/52 defences are just average (or worse than that I guess), but Staraptors 85/70/60 defences aren't exactly Shuckle level ether, and Talonflames 78/71/69(lol) defences aren't making it shine either.
TL:DR, I believe Honchkrow getting Tough Claws would be batshit insane overpowered (and I would totally vote for it because it's Staraptor on steroids!)
(Quick Note: I don't have an opinion on the other theorymons. I'm sorry :( )