I playtested a 'double dance' Kingdra a bit online (draco, surf, agility, focus energy), and it works pretty dang well. There are four main pokemon who this Kingdra simply cannot get passed, and they are Ferrothorn, Azumarill, Florges, and mega Kangaskhan. Ferrothorn only takes around 25% from crit Draco, and can thus set up leech seed and do his thing easily. Azumarill doesn't take 50% from Hydro pump crit, so it can come in on a draco (or a hydro pump if you predict correctly) and take Kingdra down with play rough, Florges takes around 40% from Hydro pump, so it can toxic, wish, then protect, and toxic stall. Plus H-pump can certainly miss. I, personally, have been running surf instead. I haven't looked at it enough, but it seems to me that whatever H-pump kills, surf also can. At the least, it's not worth it to me when draco can also miss. Finally, Mega Kanga is simply faster and can ohko with return.
It's also rather difficult for Kingdra to set up and also still have enough hp to handle the large amount of priority in the meta right now. While using focus energy, if Kingdra takes too much damage, it will simply be revenge killed by Talonflame, Mamoswine, Mega-Mawile, Mega-Absol, Aegislash, or Diggersby. It's lucky that this set is not well known yet, so it does a lot better, but as time goes on, its problems will become more defined.
There were several games where I found agility a more needed boost and Kingdra could just sweep with that. Having the option to use one or the other (or in the best case scenario, both) is worth being walled by Ferro (which can be taken down if whittled down enough, crit draco still does almost 50% to standard Ferro). Kingdra is pretty dang good, despite all the new fairies on the prowl.
In response to the comment above, the reason the sniper Kingdra is more interesting than nasty plot Porygon-Z, is that it gets critical hits, which blast right through special defense boosts. Pokemon like Sigilyph and Clefairy with their cosmic power/ calm mind shenanigans, with enough boosts, will not be taken down by Porygon-Z as it will need quite a few nasty plots set up. Kingdra just needs to focus energy once, and then he can just blast right through the sdef boosts for the ohko. The same goes for Dragonite and T-tar, draco can crit right through multiscale for the ohko, and surf can crit right through the sandstorm sdef boost. These buffs are quite nice, wouldn't you say?
It's also rather difficult for Kingdra to set up and also still have enough hp to handle the large amount of priority in the meta right now. While using focus energy, if Kingdra takes too much damage, it will simply be revenge killed by Talonflame, Mamoswine, Mega-Mawile, Mega-Absol, Aegislash, or Diggersby. It's lucky that this set is not well known yet, so it does a lot better, but as time goes on, its problems will become more defined.
There were several games where I found agility a more needed boost and Kingdra could just sweep with that. Having the option to use one or the other (or in the best case scenario, both) is worth being walled by Ferro (which can be taken down if whittled down enough, crit draco still does almost 50% to standard Ferro). Kingdra is pretty dang good, despite all the new fairies on the prowl.
In response to the comment above, the reason the sniper Kingdra is more interesting than nasty plot Porygon-Z, is that it gets critical hits, which blast right through special defense boosts. Pokemon like Sigilyph and Clefairy with their cosmic power/ calm mind shenanigans, with enough boosts, will not be taken down by Porygon-Z as it will need quite a few nasty plots set up. Kingdra just needs to focus energy once, and then he can just blast right through the sdef boosts for the ohko. The same goes for Dragonite and T-tar, draco can crit right through multiscale for the ohko, and surf can crit right through the sandstorm sdef boost. These buffs are quite nice, wouldn't you say?