This looks like a UU team to me, considering the presence of Scrafty. Seismitoad isn't exactly the best choice in UU because of its...averageness. Kingdra is a better Rain setter-upper; also, if you intend on keeping Seismitoad, mono-Water isn't that good, since there may be a good chance you'll run into a Water Absorb user in UU:
Kingdra:
-Substitute/Rain Dance/Draco Meteor
-Dragon Dance
-Waterfall
-Outrage
Nature: Adamant/Lonely
EVs: 252 Atk/4 SDef/252 Spe
Item: Leftovers/Lum Berry
Ability: Sniper/Swift Swim
or
-Draco Meteor
-Hydro Pump/Surf
-Dragon Pulse
-Hidden Power (Electric)/Surf
Nature: Modest/Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Choice Specs
Ability: Swift Swim/Sniper
or
-Dragon Dance
-Waterfall
-Outrage
-Rest
Nature: Adamant
EVs: 252 Atk/4 SDef/252 Spe
Item: Chesto Berry
Ability: Swift Swim/Sniper
Escavalier is just too slow to set up Swords Dance. Like I said before, it's better off hitting things straight off the bat with Choice Band-boosted Megahorns. Replace SD with Return and Lefties with Choice Band; change the EV spread to 248 HP/252 Atk/8 SDef; this allows Escavalier to take less damage from entry hazards.
As I said before, relying on critical hits is an unreliable strategy. If you want Drapion to be offensive, these are your best bets:
-Pursuit
-Earthquake
-Aqua Tail
-Crunch/Toxic Spikes
Nature: Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Life Orb/Choice Band
Ability: Sniper
or
-Swords Dance
-Crunch
-Earthquake
-Aqua Tail/Taunt
Nature: Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Life Orb
Ability: Sniper
What's the point of a Careful nature if Scrafty isn't investing in Special Defense? Use a Jolly nature instead. Scrafty should only use a Careful nature when it's using Bulk Up.
Jolly lowers Special Attack. Timid may be what you're looking for here. Swoobat may not be useful in UU, but at least it has Simple to make setup somewhat easier. Mono-Psychic is terrible, since Dark types can come in and Pursuit Swoobat to death:
-Calm Mind
-Stored Power
-Hidden Power (Fighting/Ground)
-Air Slash/Substitute
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb/Leftovers
Ability: Simple
Sigilyph is also a better option in UU because of Magic Guard; it also hits harder:
-Cosmic Power/Calm Mind
-Stored Power
-Psycho Shift
-Roost
Nature: Bold
EVs: 252 HP/252 Def/4 SDef
Item: Flame Orb
Ability: Magic Guard
or
-Psychic/Psyshock
-Air Slash/Ice Beam
-Heat Wave
-Roost/Hidden Power (Fighting)
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb
Ability: Magic Guard