Recommendations for an all-around OU wall?

Gliscor. He is pretty much the best OU wall, no doubt. He may not have the best typing advantages, but his toxic stalling can prove to be a great annoyance to your enemies. Gliscor is the BANE of any team without Ice moves, pretty much. He's weak to water too but if you know Pokémon well enough, you should know which ones are going to carry a water or ice move.

I've heard some people argue that a staller isn't a wall, but that's stupid, imo. I think Gliscor can easily hold his own, slowly whittling down your opponents whilst he recovers HP for himself with Poison Heal. His typing gives him immunity to another typing so if you have an Electric threat, switch him in.

Another tip would be to use protect on the first turn, just so you get a free Toxic orb activation. UNLESS you think they're going to switch, though be very certain.

Gliscor is amazing, he's my favorite Pokémon and he's a solid wall in OU. He's been at the top for quite some time, even his pal Gligar was a feisty UU threat a while back, so take him in to consideration!