Surprise!
Counters priority moves with flinching Astonish.
5 species 5 as main 0 as innate 6 battle AI weight, −2 to 10 — 6 is the untouched default
In detail
When an opposing Pokemon targets this Pokemon with a priority move, this Pokemon reacts first with a 40-power Astonish that always makes the target flinch, stopping the priority move before it can be used.
Types that carry it
5 species Ghost 5
As a main ability
5 speciesSelectable — one of up to three, and only one is active.