It is a bit confusing because the ability doesn't really just Reflect everything back to target like it would seem. It wont just take the damage you should of received that round and place it on your enemy. Instead it will make your pet perform exactly what the last attack it received (meaning that ...

The addon may also be "Pokemon Trainer: The Pet Battle Mod". This is what i use to see all abilites, cooldowns and what skills are better/worse on each pet.