Originally Posted by Fat Melee Mewtwo
After using Honko's nifty calculator for OU, I've been using this set:
Thundurus-Therian @ Life Orb/ Expert Belt
Trait: Volt Absorb
EVs: 4 Atk/ 252 SAtk/ 252 Spd
-Hidden Power [Ice]
With this set only Jirachi, Latias, Pink blobs, Ferrothorn (Don't count Ferrothorn if you use Focus Blast) can be considered as viable counters. Even then, without recovery, Latias/Ferrothorn can't wander in on a HP Ice/Super Power more than once and Chansey/Blissey barely evades the 2HKO. Considering this, Scizor makes an excellent partner as he counters all of these threats, except Jirachi, while forming a very powerful Volt Turn duo. On top of that, his infamous Bullet Punch also helps in downing many of Thundy's revenge killers. Defensive Donphan plugs up the remaining holes by countering Jirachi and spinning/setting up Stealth Rocks. Just using a quickly slapped together team with this core has made laddering an easy ride. It's disgusting just how fast, versatile, and powerful this set is. (I've even seen this thing take an HP Ice from a Landurus-I after Rocks)
Having your main STAB only at 70 Base Power is quite dissapointing. Taking an HP Ice from Landorus isn't that impressive considering it is an unSTABED 70 BP move coming from uninvested special attack. Chansey isn't going close to being 2hko'ed considering the attack drop.
The best way to use Thunderus is just to use that monstrous SpA attack stat and using his awesome STAB. Don't go mixed because that coverage only hits Blissey/Chansey which you can just smash through anyway. Consider this: a +2 Timid Thunderus with Life Orb has the ability to 2HKO Calm
Chansey with Thunder
after Stealth Rock.
So since you can bypass Chansey with Thunder, you can drop Focus Blast making room for the SubPlot set that was mentioned early. What I really like about SubPlot is that it bypasses priority and speed which (seems) Thunderus has issues with. To those who say SubPlot has coverage issues, you have the potential to get to +2 behind a Substitute no? Thunder has insane power behind a Substitute, just smash with your STAB's alone! This is with a Timid, +2, Life Orb Thunderus-T
Thunder vs Standard Ferrothorn: 204-240 (57.95 - 68.18%) -- guaranteed 2HKO
Thunder vs Standard (252 HP/252 Def) Calm Blissey: 387-456 (54.2 - 63.86%) -- guaranteed 2HKO
Thunder vs Standard (252 HP/252 Def) Calm Chansey: 322-379 (45.73 - 53.83%) -- guaranteed 2HKO after Stealth Rock
Thunder vs Sp. Def Jirachi: 406-478 (100.49 - 118.31%) -- guaranteed OHKO (yeah don't rely on jirachi to check Thunderus)
Your best bet against this monster in OU if you don't have a Gastrodon is Tyranitar. Brings in Sand to mess with Thunder's accuracy and resists Hidden Power Ice. Have fun though with the Focus Blast miss chance of living.Thunder vs Sp. Def Ttar 399-469 (98.76 - 116.08%) -- 87.5% chance to OHKO (guaranteed with Rocks). Ninetales is in a similar boat with a 50% chance to live Thunder.
tl;dr Fuck coverage just use SubPlot smash with Thunder