Somewhat related to this question, what I want to ask is, there were a couple of instances in the smogon forums where people where ditching water stab in favor for something else like gyarados in this case. In the sharpedo analysis over at the Sixth gen analyses forums, waterfall was considered not a good option either.Personally for Gyarados I think that the taunt/ eq set is very solid. Eq hits most of what waterfall would too plus some others like T-tar and fires (break tran balloon with crunch before anyone says anything), and it still has a strong stab in Crunch to hit things like celebi with and things that are immune/ resistant to ground. There is no question that in a meta where mega sableye is literally everywhere taunt is a very good thing to have.
Is water stab not as good anymore?