Here's what my line up looks like so far:
Bulky Water counter
To cover the 4x Ice weakness of Landorus
& a Electric, Dragon or Bulky Water Pokemon, not yet determined.
I'm thinking Magnezone (Steel Trapper), Haxorus (Sword Dancing Wallbreaker), Hydreigon (special threat) or Milotic (resttalker). Any recommedations will be welcome.
I went to the pokecommunity (I'm Stoney the Togekiss there) & got some help & this was the line up they recommended...
Gastrodon looks appealing, as well as Double Dance Haxorus...
& the all-out offensive set with Hydreigon looks great too... (my choice of item will be Expert Belt)
I'll continue my research at Smogon...