If Rotom becomes a major problem, metagross will start running Gravity.
Is there any chance that Headsmash Aggron might make it into OU?
Headsmash choice banned, with stealth rocks in place for those boarderline, OHKOs
Aerodactyl
kazam
Azelf
Blissy
Celebi
Dragonite
Dusknoir
Electrive
Gengar
Gyaradoes
Heracross
Infernape
Jolteon
Kingdra
Latias
Mamoswine
Ninjask
P-Z
Rotom
Salamence
Scizor
Snorlax
Smeargal
Tentacruel
Togekiss
Vaporeon
Weavile
Zapdose
Takes off more than half damage, no other effects added.
Breloom
Cresselia
Gliscor
Skarmory
Suicune
Tyranitar
Heatran
That's about 3/4th of the OU
both of these list assume Max HP and DEF EVs on the part of the pokemon getting hit. Meanwhile, Pursuit is only going to do about 7 percent considering the attack has an attack stat of 478.
Of course, a great deal of those pokemon would never switch in on Aggron. Most likely, he can expect switches in on Flygon, Metagross, Swampert, and Rhyperior
However, even those 4 with all defense evs and hp evs still manages to come up landing between 1/4th damage and nearly one half of their total hp, no stealth rock or spikes included.
Then there is Armaldo with curse. In sandstorm, with neutral EVs it will have a 342 special defense stat, with a potential 388. This plus a great HP stat and defense stat means he walls everything.Thoughts?
Also, about Tail wind, the main use I see is doubling the speed on someone who is choice banned, and I see Aerodactyl or Suicine being the most likely users to set it up. For instance, I use tail wind, next turn I switch in Aggron. I use headsmash, you switch in Metagross during. Using the most used set, you will take half damage, no spikes or rock included. Because of tail wind, I'm faster than you and headsmash you again for the KO.