It will probably switch over to WG, as you should not get a Hidden Power move when you reroll. But I have not tried this out yet.
As for Starmie with WG/HP, it is an absolute beast. It does more damage than Vaporeon and has water gun that outclasses Gyarados when countering Fire/Ground/Rock types. Be sure to dodge well though.
GamePress
What happens when you use fast TM on Starmie?
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