Tech in dusknoir for more spread, or else kingdra's +20 to a bench gets destroyed by nidoqueen- bats won't help that at all either. Kingdra can spread, but more often than not it won't get bench KO's due to the amount of nidoqueen/blisseyprime that will be in every meta. Bats are used more often than not on high hp actives that kingdrabelt can't KO with 80 alone, and then sit on the bench. Pluspower helps with all of this, as does dusknoir. It allows you to 1 shot something huge, without it being healed by Queen first.
You don't have to take my advice, I'm just saying what works against most decks from my experience with Kingdra varients. Try out the deck as much as you can, playtest, playtest, playtest, and figure out what works best for your personal style.