Relic Stone
Other battlers don't benefit from STAB.
4 species 3 as main 1 as innate 6 battle AI weight, −2 to 10 — 6 is the untouched default Ignored by Mold Breaker
In detail
While the user is on field, every other Pokemon does not receive a STAB bonus from typing or abilities.
Types that carry it
4 species Rock 3 Bug 1 Ghost 1 Ground 1
As a main ability
3 speciesSelectable — one of up to three, and only one is active.
As an innate
1 speciesAlways on, alongside whichever main ability is chosen.