[Scripting Question] Ability that activates when pokémon faints

[KarmaGiver]

Ability that activates when pok?mon faints

I was wondering if i can make a ability that activates when a pok?mon fants in battle but i don't know where to start messing with, can someone please help me? thanks in advance.

 

[Rot8er_ConeX]

Aftermath
Innards Out

Both these abilities trigger when the holder faint.

 

[KarmaGiver]

Thanks for the help, the aftermath one did the trick, but i had to move the ability to the script section that checks the damage on battlers in the pok?battle_battlers script, cuz aftermath only activates when the pok?mon takes contact damage and i wanted it to activate on all types of damage.