What are some good Special Walls for Gen 6 OU?

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Tentacruel @ Black SludgeTrait: Rain Dish/Liquid OozeEVs: 252 HP / 236 SDef / 20 SpdCalm Nature- Toxic Spikes/Knock Off- Rapid Spin- Scald- Ice Beam

Blissey @ LeftoversTrait: Natural CureEVs: 252 HP / 4 Def / 252 SDefCalm Nature- Wish- Protect- Seismic Toss- Toxic/Stealth Rock/Thunder Wave

Chansey @ EvioliteTrait: Natural CureEVs: 4 HP / 252 Def / 252 SDefBold Nature- Softboiled- Thunder Wave/Toxic- Stealth Rock- Seismic Toss

Heatran @ LeftoversTrait: Flash FireEVs: 248 HP / 252 SDef / 8 SpdCalm Nature- Lava Plume- Stealth Rock/Roar- Protect- Toxic/Will-O-Wisp

Jirachi @ LeftoversTrait: Serene GraceEVs: 252 HP / 236 SDef / 20 SpdCareful Nature- Wish- Stealth Rock/U-turn- Iron Head- Thunder Wave

Tyranitar @ LeftoversTrait: Sand StreamEVs: 252 HP / 4 Atk / 252 SDefSassy Nature- Stealth Rock- Fire Blast- Pursuit- Stone Edge

Latias @ LeftoversTrait: LevitateEVs: 252 HP / 4 Def / 252 SpdTimid Nature- Calm Mind- Recover- Dragon Pulse- Hidden Power [Fire]/Psyshock

Gastrodon @ LeftoversTrait: Storm DrainEVs: 252 HP / 4 SAtk / 252 SDefCalm Nature- Scald- Earth Power- Recover- Toxic

Celebi @ LeftoversTrait: Natural CureEVs: 252 HP / 236 SDef / 20 SpdCalm Nature- Giga Drain- Recover- U-turn- Perish Song/Stealth Rock/Thunder Wave