Get rid of sandstorm on Shuckle. Give it rollout. It can be usefull.
Excadrill is great but get rid of drill run for rock slide. It's worked wonders for me.
Don't play mixed camerupt.
Evs. 252 sp. attack, 252 hp. The other four don't matter.
Item choice band
Hidden power grass.
The goal is to kill wit a specs boosted eruption.
Affront is great but magnet rise is useless because with a choice item you're locked in it. Get rid of magnet rise for hp water. Mainly use head smash for great damage and no recoil. Also get rid of 252 defence and put it into hp. It's better bulk.
Baton pass mew is a good idea but get rid of psyscic for agility. Give it the leftovers.
This Shuckle needs to go. Imagine this scenario
Shuckle used power trick.
Ferrothorn used power whip.
Shuckle has fainted.
Replace Shuckle with tyranitar for permanent sand.
Item life ob
Evs 252 attack, 252 hp.
All in all, a pretty good team.