Water Bubble doubles the power of physical and special Water-type moves regardless of the Pokemon's type, including the Z-Move Hydro Vortex, and has no affect on status Water-type moves.
OK: I would really like some clarification on this. The original video, Liquidation only does similar damage to SE Crunch which is 170 vs 160 power which is fine. And follows the "Doubles Water Move Power". However, I am pretty damned sure even with a max vs min roll, if STAB was included in the calc, then it would have obliterated the opposing mon in this vid. Like, it would have been a clean KO. Everyone is now hyping this as some crazy powerful attacker, when I am not so sure this is the case.
Nexus' wording in the OP makes it sound like if its used on a mon not called Dewpider it doubles Water moves power. Which is great. So what I am asking is: Is this Adaptability for Dewpider, or does Dewpider NOT receive STAB on its water moves? This is a pretty big difference in my opinion.