been having fun with golisopod in doubles, First impression is actually quite savage. it eats certain stuff like greninja for breakfast, and water bubble plus rain make his aquajets hurts a lot...probably will be in the gimmick area and players will wise up, but is fun nonetheless...
Serperior with grassy terrain actually can kinda snowball faster than you say UB...
Regarding another mon im' loving in araquanid, actually I wonder if entertainment is really that gimmicky, or can become a real asset in the Mon, IMO what set gimmicks aside from strategies is how flexible and adaptable it can be.
Besides the obvious as Water bubble Golisopod or Water bubble gyarados, there can still be some surprises as water bubble Archeops with aqua tail, Water bubble Aninteails with HP water, Water bubble garchomp with aquatail, water bubble slaking, Water bubble lapras, water bubble Tapu fini, Keldeo...
And it doesnt end there cause Water absorb can open also some interesting combos too such as water absorb Hyppowdown, Water Absorb Tyranitar, incineroar, golem, Lando..
The thing is that all this pokemon can reap benefits from this abiities (from obscene water attacks, burn immunity, extra fire resistance or all the above ) while not missing their original abilities because they are either a hindrance, or activated only upon entering (intimidate, Setters)
In fact in a pinch you can actually put this on an enemy sylveon, or mega gardevoir, since they get screwed and barely would benefit (of water bubble at least)
And araquanid actually have the bulk to be able to use it, and not an expansive movepool to suffer a heavy 4MSS.
Is the wide array of potential targets you can choose that makes me wonder if this can be more than a gimmick, at least water absorb/entertainment seems like a decent anti rain strategy.