Originally Posted by Fat Haunter
Hp flying could be effective on that set. At +2 it does up to 81% to Latios and OHKOs Celebi, Landorus and Gliscor. Ferrothorn is hit for roughly ~45.
Backing this up, HP Flying is great for throwing opponents off guard. It works great as a secondary STAB, good for throwing out while your opponent figures that you'll Thunder/bolt.