Steelix is amazing as a wall. It is hands down the best wall at that tier IIRC, with tons of resistances and 2 immunities (to toxic/toxic spikes and electric moves)
A good set for steelix would be Relaxed nature (lower speed, don't worry, you don't need that speed anyways) with max EVs in HP and defense, with 6 in attack
For moves, try:
earthquake, it crushes lots of pokemon, and usually can force a swap
gyro ball, it turns a weakness (slow speed) into an advantage, what more can you ask for?
stealth rock, abuses the fact that you can force swap outs
dragon tail, since taunt users outspeed and force you to attack, dragon tail gets around taunt