Starmie @ Life Orb
Ability: Natural Cure
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Hydro Pump
- Ice Beam
- Thunderbolt
- Dazzling Gleam
A lot of things in UU are weak to water and ice, and Starmie fits the role nicely.
Krookodile @ Darkinium Z
Ability: Moxie
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Snatch
- Crunch
- Earthquake
- Stone Edge
Z-snatch boosts Krookodile's speed by 2, so it can get very threatening after some Moxie boosts.
Manectric-Mega @ Manectite
Ability: Lightning Rod
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Thunderbolt
- Flamethrower
- Hidden Power [Ice]
- Volt Switch
Manectric is one of the fastest pokemon in UU. If Starmie can bait an electric move, Manectric can switch in and get a sp. attack boost.
Gliscor @ Toxic Orb
Ability: Poison Heal
EVs: 252 HP / 184 Def / 72 Spe
Impish Nature
- Stealth Rock
- Earthquake
- Toxic
- Protect
A classic toxic orb + poison heal Gliscor. it can easily frustrate the opponent with its stalling capabilities, especially with the lack of offensive ice- and water-types in UU.
Empoleon @ Leftovers
Ability: Torrent
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
IVs: 0 Atk
- Scald
- Ice Beam
- Rest
- Sleep Talk
Empoleon handles most things Gliscor can't. It resists ice and water, which are Gliscor's weaknesses. Gliscor is immune to Empoleon's ground and electric weaknesses and resists fighting. Other than that, it has good special defense and scald to cover physical attackers.
I couldn't find a good non-mega filler pokemon for the sixth slot. I doubt that the pokemon i have are any good. Let me know wether i'm wrong.