All we know the best Special walls in UU: Grumpig and Hypno. Both have a good Special Defense Stat, and average HP, and they really can stop Special Attackers in UU. Also, they have a lot of versability in their sets. Firstly, the most used Grumpig's set: Grumpig @ Leftovers Calm Mind Substitute Psychic Shadow Ball / Energy Ball ability: Thick Fat nature: Timid evs: 252 HP / 236 Spd / 20 SpDef It cames in a Special Sweeper, and with a couple of Calm Minds, it can really annoy Special Sweepers, and also hit hard. On the other hand, we have Hypno: this one is the most used: Hypno @ Leftovers Seismic Toss / Psychic Thunder Wave / Hypnosis Wish Reflect / Light Screen ability: Insomnia item: Leftovers nature: Calm evs: 252 HP / 56 Def / 200 SpDef But it also can Nasty Plot, and use a Physical Set. And the main question is the next: Can they work in OU? Can they stand some Special Sweepers in OU? I wait for your answers.