Seismitoad @ Life Orb
Ability: Swift Swim
Nature: Modest
EVs: 4 HP / 252 SpA / 252 Spe
Scald
Earth Power
Focus Blast
Sludge Wave
Note: Electric Immunity makes an easy swap-in, decent coverage
Kingdra @ Choice Specs / Life Orb / Waterium Z
Ability: Swift Swim
Nature: Modest
EVs: 116 HP / 252 SpA / 140 Spe
Muddy Water
Draco Meteor
Scald / Hydro Pump
Ice Beam / Protect
Poliwrath @ Life Orb / Normalium Z
Ability: Swift Swim
Nature: Adamant
EVs: 172 HP / 252 Atk / 84 Spe
Low Sweep
Waterfall
Poison Jab
Belly Drum
Anti-Electric:
A. Marowak @ Thick Club
Ability: Lightning Rod
Nature: Adamant
EVs: 248 HP / 16 Atk / 112 SpD
Shadow Bone
Flare Blitz
Bonemerang
Will-O-Wisp
Pikachu @ Light ball
Ability: Lightning Rod
Nature: Timid
EVs: 4 HP / 252 SpA / 252 Spe
Thunder
Grass Knot
Hidden Power (Fighting?)
Fake Out
Note: Togedemaru can likely do the exact same, but with better stats. He's not a mascot though. :D
Aside from the Pelliper / A. Raichu / Tapu Koko thunderstorm core I wasn't too sure what would be nice so any better suggestions can replace any of the others. I've had quite some fun with Pelliper / Koko (discharge) / Pikachu in Battle Tree doubles. :p
PS: I dragged this idea out of the poll at some point, if there's no interest I'd simply skip it. :D
I think a Rain-day could be cool, with a multitude of common rain-team pokemon for people to pick from? For example:
Set-up: Pelipper @ Focus Stash / Damp Rock Ability: Drizzle Nature: Modest EVs: 108 HP / 4 Def / 252 SpA / 4 SpD / 140 Spe Hurricane Scald Wide Guard Tailwind
Politoad @ Sitrus Berry / Damp Rock Ability: Drizzle Nature: Bold EVs: 252 HP / 252 Def / 4 SpD Scald Icy Wind Helping Hand / Encore Protect
Electric-Terrain-duo: Tapu Koko @ Life Orb (unless the Swift Swim sweeper needs it) Ability: Electric Surge Nature: Timid EVs: 252 SpA / 4 SpD / 252 Spe Thunder Dazzling Gleam Taunt / Discharge U-turn
A. Raichu @ Air Balloon Ability: Surge Surfer Nature: Modest IVs: 0 Atk Thunder (maybe Electro Ball is stronger with Surge Surfer?) Psychic Focus Blast Surf / Grass Knot
Swift Swim Sweepers: Golduck @ Choice Specs / Waterium Z Ability: Swift Swim Nature: Modest EVs: 4 Def / 252 SpA / 252 Spe Hydro Pump / Scald Ice Beam Scald / Psyshock Surf / Protect
Seismitoad @ Life Orb Ability: Swift Swim Nature: Modest EVs: 4 HP / 252 SpA / 252 Spe Scald Earth Power Focus Blast Sludge Wave Note: Electric Immunity makes an easy swap-in, decent coverage
Kingdra @ Choice Specs / Life Orb / Waterium Z Ability: Swift Swim Nature: Modest EVs: 116 HP / 252 SpA / 140 Spe Muddy Water Draco Meteor Scald / Hydro Pump Ice Beam / Protect
Poliwrath @ Life Orb / Normalium Z Ability: Swift Swim Nature: Adamant EVs: 172 HP / 252 Atk / 84 Spe Low Sweep Waterfall Poison Jab Belly Drum
Anti-Electric: A. Marowak @ Thick Club Ability: Lightning Rod Nature: Adamant EVs: 248 HP / 16 Atk / 112 SpD Shadow Bone Flare Blitz Bonemerang Will-O-Wisp
Garchomp @ Choice Scarf / Groundium Z Ability: Rough Skin Nature: Jolly EVs: 4 HP / 252 Atk / 252 Spe Earthquake Dragon Claw / Outrage on relearn Poison Jab Rockslide / Protect
Pikachu @ Light ball Ability: Lightning Rod Nature: Timid EVs: 4 HP / 252 SpA / 252 Spe Thunder Grass Knot Hidden Power (Fighting?) Fake Out Note: Togedemaru can likely do the exact same, but with better stats. He's not a mascot though. :D
Coverage: Kartana @ Focus Sash Ability: Beast Boost Nature: Jolly EVs 252 Atk / 4 SpD / 252 Spe Smart Strike Leaf Blade Sacred Sword Protect
Ferrothorn @ Leftovers Ability: Iron Barbs Nature: Relaxed EVs: 252 HP / 4 Atk / 252 Def Stealth Rock Leech Seed Gyro Ball Power Whip
Celesteela @ Leftovers Ability: Beast Boost Nature: Adamant EVs: 228 HP / 44 Atk / 116 Def / 116 SpD / 4 Spe Heavy Slam Leech Seed Substitute / Flamethrower Protect
Scizor @ Scizorite (Battle Tree) Ability: Light Metal Nature: Impish EVs: 248 HP / 116 Def / 128 SpD / 16 Spe Swords Dance Bullet Punch Roost U-turn Note: Bulky Sweeper who loves rain for taking away it's major fire weakness.
Lucario @ Lucarionite (Battle Tree) Ability: Inner Focus Nature: Jolly EVs: 252 Atk / 4 SpD / 252 Spe Close Combat Bullet Punch / Iron Tail Extreme Speed / Bullet Punch Swords Dance / Ice Punch / Protect
Aside from the Pelliper / A. Raichu / Tapu Koko thunderstorm core I wasn't too sure what would be nice so any better suggestions can replace any of the others. I've had quite some fun with Pelliper / Koko (discharge) / Pikachu in Battle Tree doubles. :p