Headstrong
+1 Spdef on entry.
2 species 2 as main 0 as innate 6 battle AI weight, −2 to 10 — 6 is the untouched default Ignored by Mold Breaker
In detail
Raises the Pokemon's Special Defense stat by one stage when switching into battle.
Types that carry it
2 species Poison 1 Psychic 1 Water 1
As a main ability
2 speciesSelectable — one of up to three, and only one is active.