I knocked out an opponent with my GX move. My GX also cannot be damaged on the opponents next turn. My opponents card had an ability that make it so no effects can affect it or any of his other Pokemon. I do not believe his Wind Charm works if I have defeated his Pokemon.
Assuming it is this card:
It says that as long as this Pokemon is your active Pokemon, effects are prevented. So once Suicune is inactive, Wind Charm is no longer enabled.
Hope I helped. :)