Poison Heal pretty much walls Salt Cure,Mortal Spin,and Covert Cloak lemme show u why
Salt Cure
Poison Heal heals you 1/8 hp every turn so (if your not Kyogre Or Steelix-Mega) Poison Heal and Salt Cure are essentialy cancelling each other out
Mortal Spin
Its pretty obvious why Poison Heal...