FieldMultiplyBattleStatAbAttr should always be FieldMultiplyBattleStatAbAttr for the time being
Rest ...args: any[]Pokemon the Pokemon applying this ability
Stat the type of the checked stat
Utils.NumberHolder the value of the checked stat
Pokemon the Pokemon with the checked stat
Utils.BooleanHolder whether or not a FieldMultiplyBattleStatAbAttr has already affected this stat
Rest ...args: any[]unused
Applies a field Battle Stat multiplier attribute