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Almost ever special wall outclass Regice, which after gen 3 has been laughably bad. Also, Ice is really bad type for walls because it's weak to everything and only resists itself.
Blissey has better HP and better Recovery (Using Rest or relying on Items gets you almost nowhere)
Lugia has Multiscale
Toxapex can recover HP for days
Vaporeon has good resistances and Wish+Protect, as well as godly HP stat
Latais has several good ways to heal itself and Calm Mind for extra SpD boosting
Reuniclus is like Latias but slower
Slowking does a lot of the same stuff as Reuniclus but with extra resistances thanks to its Water typing
Fuck it, I wouldn't be surprised if stuff that isn't even meant to be a wall but has a decent defensive typing and a good healing move like Charizard-X with SpD investment or specially defensive Scizor or fucking Yveltal wearing an assault Vest trying to regain health through Oblivion Wing make better Special Walls than fucking Regice.