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Water Bubble reduce damage from Fire type attacks and make Araquanid immune to burns, it DOUBLES the power of any and all Water type moves used by it. That makes its new move Liquidation, an 85 base power physical water type move, have 170 power. It has the potentially to hit wit an attack as if it had a base attack stat of 190, if calculations by Smogonites are correct. That's Mega Mewtwo X levels of power.
And, because it learns Entrainment, it can pass Water Bubble to its allies to make them have Water Bubble too. Think Mega Swampert, Gyarados, Starmie, Golisopod, etc - I think you can see where this is going... in short, this is a really freaking good ability.
Oh my
(Not my info by the way)
