I've been working on a trick room aggron that I think might be interesting.
TR Aggron @ life orb
Rock Head ability | Brave nature
252 atk/hp, 6 def | 0 spe IV
Metal Burst
Head Smash
Earthquake
Low Kick
the idea is to send out trick-room/kaboom claydol (or whomever else) and setup, and then for the next 4 turns wreak havoc with aggron. head smash with impunity as your rock head ability protects your neck. EQ serves as a powerful attack that lends to coverage. aqua tail is another option as it 2hkos donphan...you just won't get the chance.
low kick is for the regis, who are likely switch-ins against our pal. both are 2hko'd. neither can ohko with EQ.
steelix is faster in a trick room, but doesn't ohko with EQ. metal burst ftw. same goes for gastrodon and quagsire. metal burst also adds something of use for aggron if he lives through the trick room massacre or if you don't pull off the setup.
our aggron vs. common UU walls -
head smash destroys chansey.
you need 186 sp.d to survive milo's surf. you need 120 sp.d evs but I haven't calc'd how that would effect 2hkos/ohkos.
donphan destroys you, if you have aqua tail hit him as hard as you can or switch out to metal burst another day.
pory2 can take a head smash, recover and then possibly take another. there's a small chance to 2hko. (stealth rock helps). much better chance to 2hko clefable after softboiled, but doesn't one shot.
2hko's max def/hp uxie with head smash.
EQ 2hko's defensive drapion (who can't ohko back), head smash hits a little harder so start with it because it one-shots min hp/def. follow up with EQ for accuracy if they survive.
2hko max def spiritomb with headsmash, can ohko min def.
2shots weezing with head smash.
one-shots ludicolo w/ head smash.
hariyama is 3hko'd at best, but you'll get ohko'd by close combat or 2hko'd by BB/force palm. he can't ohko with brick break or force palm, but you're faster than him so no metal burst. switch out to metal burst another day or do what you can to harm him with EQ and stall out TR. (because you don't want hariyama taking advantage of your setup).
so ultimately,
I'm predicting this set will draw out the opponents best wall and 2shot it without much fear (so long as it isn't donphan or hariyama. it would be smart to have a counter for them waiting in the wings), and then hopefully go on to take out at least another member of their team.