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