Best water gun - hydropump mons
Vaporeon > omastar > blastoise > starmie > golduck > seadra.
Is this the correct order?
Answers
Yes, I'd think of Starmie as a "glass cannon" compared to Vaporeon - Starmie is going to give you better burst damage, all things being equal, but is going to die faster. If I was attacking a gym that had two Rhyhorns in a row, for example, I might put a strong Starmie up to power them down, or a Vaporeon in to outlast them, depending on the rest of the defending team.
I use gun/pump Starmie for prestiging against alakazam. The psychic typing comes in handy against kazam moves. Using the same thinking, Omastar would be best against fire. Probably vaporean or starmie against Rhydons, starmie maybe again because half the time rhydons have rock smash fighting type quick move.
Enemy gyms it's max power which for me means vaporean or pump gyarados.