Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
Let's do this:
Weavile:
Chill - Dig - Ice Punch
Kingdra: Time to finally put this arena's effects into good use, assuming the bide doesn't hit you of course.
Surf - Scald - Surf
Kindra: Kill
Ice Beam (Togekiss) - Scald (Muk) - Scald (Muk)
If togekiss is not KO'd on action 1, keep on icebeaming it till it is KO'd
Weavile: Fake Out (Muk) - Dig (Muk) - Ice Punch (Muk)
IF muk uses dig on action 2, use Icepunch on that action instead
Let's see how this goes
Weavile:
Fake out (Porygon - Z) - Ice Punch (Togekiss)- Ice Punch (Togekiss)
Serperior:
That sky attack will likey KO, so let's go out with a bang:
Mega Leafstorm (Leafstrom + Leafstorm Combo - at Porygon-Z) - rest - Glare (Togekiss)
Alright, Serperior enjoy that contrary ability.
Start out with a Leaf Storm against Porygon-Z for some nice Damage, then set up a Light Screen and finally hit Porygon -Z with another leaf Storm.
Leaf Storm (Porygon-z) - Light Screen - Leaf Storm (Porygon-Z)
IF togekiss uses thunder Wave or...
Kingdra:
Heh, watch as he wastes his turn.
Evasive Agility (it dodges +1 combo attacks, thus it should work)- Dragon Rage (Shuckle) - Dragon Rage (Shuckle)
If that evasive agility would not dodge the attack, just use protect instead
Weavile:
Night Slash (Gengar) - Focus Punch (Shuckle) - Ice...