Pokemon moveset effectiveness

I have 3 Vaporeon, and each has different moves. 1 with Water Pulse, 1 with Aqua Tail, and the other one with Hydro Pump.

Which one should I keep to power up? I think the choice is Vaporeon with Aqua Tail and Hydro Pump. Aqua Tail has 2 bars with 50 power, and Hydro Pump has 1 bar with 60 power. I think it should be the one with Aqua Tail since the power difference is just 10 and the gauge can fill faster. Which is the best for battle efficiency?

Solution 1:

You can find the best moveset for a pokemon on this site - e.g. for Vaporeon it's Water Gun and Aqua Tail.

The site takes into account not only how long the attack takes, but also the critical chance and whether the attack gets a bonus for being of the same type as the pokemon (STAB).