the combination of Air Slash and Serene Grace allows Togekiss to fence
off many foes, posing a decent offensive presence. With Air Slash's
increased 60% flinch rate paired with paralysis, the opposing Pokemon
is left with just a 30% chance of successfully moving.
So its 30 Percent change w/o the rock
All moves that actively deal damage and do not already have a chance
to flinch will gain a 10% chance of flinching the opponent. (This
chance doubles to 20% if the holder has Serene Grace.)
So kings rock will not help
30% :2 (flash) = 15% Percent chance of attacking