>>18721190>poison/rock>ability - lavitatewhere is your god now
oil is consumed by flames, so it should be weak to fire.
black oil is often made from fossilized trees, hance grass
alternate suggestion-
poison type with the ability 'black gold'
the pokemon is weak to fire
the pokemon is can't use attack moves that don't get stab
upon touch, enemy pokemon might get 'black gold' ability