[Scripting Question] Custom Ability boosts damage of next pokemon's attack

[Tommaniacal]

Hello, I'm attempting to script an ability with two different effects:

In double battles, if both allies go for a damaging attack the same turn, it increases damage by 30% (for both pokemon).

In single battles, it increases the power of pivot moves (Volt Switch and U-Turn) and also the first move used by the pokemon it pivots into by 30%. It wouldn't boost damage if you directly switched into the next pokemon, only if you use a pivot move.

So far in Pokebattle_Move, I have:

    if attacker.hasWorkingAbility(:PACKHUNTER) && @function==0x0EE
       damagemult=(damagemult*1.3).round
    end

I'm not really sure where to go from here. I'm guessing it would use turncount==1, but I don't know how I'd link it to the previous pokemon having Pack Hunter and using a pivot move. Any help would be greatly appreciated!