I could RNG that I suppose but there are easier and better options for that. First, Aqua Tail is useless due to Glaceon's meager attack stat so using it wouldn't be good...plus it has 90 accuracy so it will miss now and then. Water pulse is 10 power weaker than hidden power would be and it has a 20 percent chance to confuse the target so using it to heal Vaporeon wouldn't be a good idea either.
So, to sum up, you want to use hidden power water for your Glaceon if its purpose is for healing. And, if that is what you want then that is easily done in 5th gen RNG.