Aggron

Sturdy
OHKO moves will fail.
Rock Head
Recoil moves have no recoil.
Type Tier
Steel / Rock UU
Level 100 Statistics (see level 5, 50, 100)
Min- Min Max Max+
HP
70
- 281 344 -
Atk
110
230 256 319 350
Def
180
356 396 459 504
SpA
60
140 156 219 240
SpD
60
140 156 219 240
Spe
50
122 136 199 218

Overview

Aggron is pretty much limited to UU play. Nonetheless, it loves switching in on the likes of Tauros, Slaking, Skarmory, Blissey, and Snorlax though, and easily scares out Toxic stallers such as Umbreon. Furthermore, Aggron partners well with Choice Band users such as Crobat, as well as Gengar, who is immune to its greatest weaknesses.

Name Item Ability Nature

SubPunch

Leftovers Sturdy Adamant
Moveset EVs
~ Substitute
~ Focus Punch
~ Rock Slide
~ Thunder Wave
228 HP / 252 Atk / 28 Spe

This set can wreck about anything that isn't a Ground-type. Thunder Wave cripples Water-types and random fast sweepers, and allows Aggron to fish for full paralysis by continually using Substitute. Then, use Rock Slide to probably nearly flinch them to death. Focus Punch hurts a lot from Aggron's awesome Attack. As it dents even standard walls such as Snorlax and Skarmory, the UU champions Solrock and Sandslash will naturally have a lot of trouble taking this on. 160 Speed lets Aggron outspeed Weezing. Next, maximize Attack, and put what you have left in HP.

Name Item Ability Nature

Choice Band

Choice Band Rock Head Adamant
Moveset EVs
~ Earthquake
~ Rock Slide
~ Double-Edge
~ Focus Punch / Iron Tail
140 HP / 252 Atk / 116 Spe

This set is pretty straightforward. Aggron's key resistances to certain attacking types such as Rock and Normal lets it switch in easily with some prediction. Again, your opponent will probably send in a bulky Water- or Ground-type, so use prediction accordingly.

Checks and Counters

Swampert, the obvious multi-purpose Rock counter, walls anything Aggron can throw at it, as does Claydol. Metagross is a good counter to any non-Earthquake Aggron, and even with it, would 3HKO anyway without a boost from Choice Band. Lastly, Suicune and other bulky Water-types won't be taking much damage at all from Aggron's attacks. However, note that Aggron can potentially beat Skarmory or Weezing one-on-one, thanks to Substitute blocking Weezing's Will-O-Wisp, and paralysis and a 30% flinch chance possibly doing major damage to both, though this is unlikely.