Mmm, I prefer to use Landorus, both formes. Landorus-T has good bulk and intimate support, so it can switch into a bunch of things like Heracross, and it's pretty much bait for Skarmory or other Landorus to walts right in, only for them to have their items like Shed shell or Choice Scarf removed. It' can be a good pivot for magnezone!
Landorus-I kinda works the same way, but not as bulky, and usually it attracts pokemon with special defense; (like I've had multiple experiences where people switch in their Chanseys or Clefables to it) for them to be knocked off their items too~
I think the best way to pivot against them is to have pokemon with Justified, like Keledo to tank the hit and gain attack, but, otherwise If there was a tough pokemon that had their item knocked off, I'd switch to them. I wouldn't do this far too often though, since the opponent will know what you're up to and predict around that~