I think UU. Sorry, but on PO how do you differentiate which trainers are using what tier teams?
Team so far:
-Empoleon
-Lanturn
-Ludicolo
-Swampert
-Slowbro
-________
As a previous PO user, I'm guessing that the tier the person is using is below their name.
Azumarill could be an option in the last slot because of its Huge Power ability, but generally, Kingdra is better because of its good secondary STAB.
Here are some possible viable sets you can use for both Pokemon:
Azumarill:
-Waterfall
-Aqua Jet
-Return/Double-Edge
-Ice Punch/Superpower
Nature: Adamant
EVs: 252 HP/252 Atk/4 Spe
Item: Choice Band
Ability: Huge Power
or
-Substitute
-Focus Punch
-Waterfall/Ice Punch
-Aqua Jet/Toxic
Nature: Adamant
EVs: 252 HP/252 Atk/4 Spe
Item: Leftovers
Ability: Huge Power
Kingdra:
-Dragon Dance
-Waterfall
-Outrage
-Rest
Nature: Adamant
EVs: 252 Atk/4 SDef/252 Spe
Item: Chesto Berry
Ability: Swift Swim/Sniper
or
-Rain Dance
-Hydro Pump
-Draco Meteor
-Dragon Pulse/Surf
Nature: Modest
EVs: 252 SAtk/4 SDef/252 Spe
Item: Leftovers/Life Orb
Ability: Swift Swim
or
-Substitute
-Dragon Dance
-Outrage
-Waterfall
Nature: Adamant
EVs: 252 Atk/4 SDef/252 Spe
Item: Leftovers
Ability: Swift Swim/Sniper
or
-Dragon Dance
-Waterfall
-Outrage
-Rain Dance/Draco Meteor
Nature: Adamant/Lonely
EVs: 252 Atk/4 SDef/252 Spe
Item: Life Orb/Lum Berry
Ability: Swift Swim/Sniper