Alright about the Altaria set pleae use this format
Altaria@ Leftovers( im guessing thats the item being used or Life Orb)
Trait: Natural Cure
Nature: Adamant(is better since you need to hit atleast a little bit harder)
Ev: 252 Hp / 56 Atk / 200 SpD(needs to hit a little Harder)
-Cotton Gaurd
-Dragon Claw
-Roost
-Toxic / Dragon Dance
Ok so i think the set is intresting but there is a few problems. Ice types will generaly outspeed you and Possibly Ko even with the Bulk as you are 4x weak to it so a little bit out of that to Atk want effect it too much, Adamant is used over it and 56 Atk evs are used because you need to hit a litle bit harder since(From what i cant tell unless it is one) it seems to be more of a bulky sweeper instead of a boosting wall. I would Probably Change Toxic to Dragon Dance as with massive bulk allows you a chance make you A) hard to break on the Defensive side and B) easier for it to set up DD with. but i can see how it can easily toxic stall something. So i suggest this
Altaria @ Life Orb
Trait: Natural Cure
Ev: 200 Hp / 112 Atk / 200 SpD
-Cotton Gaurd
-Dragon Dance
-Roost
-Dragon Claw