RE: Counter That Pokemon! - Round 5
Porygon2@ Eviolite
Trait; Trace
Bold nature
252 HP/184 Def/72 SpDef
~Ice Beam
~Recover
~Toxic
~Tri Attack
Traces Volt Absorb so it obviously takes Thunder like a champ. Better than like a champ, it heals itself.
Supwerpower vs 252/184 Bold Porygon2
34.76-40.64%- 3 hits to KO
and that's not including that Superpower drops your Attack stat. Ice Beam will do lots of damage, otherwise you can always toxic it to add up Life Orb + Toxic since no regenerator like Tornadus-T has. Recover off whatever damage you take in the process, because they aren't 2HKOing you even if they predict the switch-in without a crit.
Also I'm questioning Lanturn and how viable it is in OU play. It counters Thundurus, but at the cost of being setup bait for Ferrothorn, Celebi, Breloom (with or without Technician), and Keldeo, getting toxiced by anything on a Rain Stall team, most notably Gastrodon, doesn't have recovery to shrug off hazard damge, and gets outsped by everything in OU that uses Earthquake save for MAYBE Donphan, which means it loses to every single sand sweeper or dragon sweeper in the game.
EDIT: CHansey calcs yo
Superpower vs 4 HP/252 Def Bold chansey
48.29-57.01%
-1 Supwerpower vs 4 HP/252 Def Bold Chansey
32.09-38.01%
So actually, with Rocks, There is a possibility chansey gets 2HKO'd. Even a 252 HP/252 Def Bold Chansey can get 2HKO'd, although it probably won't. a 4 HP/252 Def Bold Chansey acually has a very legitamate shot at being 2HKO'd.