No, wall is used for both Physical and Special. Also, unless you're kidding (probably) Bastiodon is not a physical wall..since it's pretty much like Aggron ( X4 weak to Fight and Ground).You don't really need to say physical if you put in wall, because "wall" means physical defender. Definitely Rampardos though. Uh... Wait... I meant Bastiodon... Yeah, that's right...
phailuuuuuuuuuuuuure1, Hippowdon is the best in OU.
2, Giratina is the best in ubers.
3, you all obviously know nothing about walls.
4, in b4 lock.
The best wall EVER, whether physical or special, in my book (or pokedex I guess) is none other than the great, unstoppable...