Here is an eruption/water shuriken spam team that I have been using and doing pretty well with (high 1300s on ladder). I worried that dedicated special walls and hazards would be rough since I have effectively no physical power and no removal, but between 1 levitate, 2 HDB users, and a mostly suicide lead, hazards don't end up being too bad, and I haven't seen people using things like Goodra-H or Blissey much, so that hasn't been a problem either.
Torkoal @ Heat Rock
Ability: Drought
Tera Type: Fire
EVs: 248 HP / 252 SpA / 8 SpD
Modest Nature
IVs: 0 Atk
- Stealth Rock
- Earth Power
- Lava Plume
- Eruption
Mostly used as a lead to set stealth rock and sun, then pass eruption. Can occasionally snag a burn on something trying to set up, which is nice.
Greninja @ Choice Specs
Ability: Protean
Tera Type: Water
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Switcheroo
- Ice Beam
- U-turn
- Water Shuriken
Really appreciates protean + eruption + sun + specs, can hit anything that isn't immune or specially bulky and resistant extremely hard. Passes water shuriken, which everyone else below appreciates
Skeledirge @ Heavy-Duty Boots
Ability: Unaware
Tera Type: Fire
EVs: 248 HP / 252 SpA / 8 SpD
Modest Nature
IVs: 0 Atk
- Torch Song
- Earth Power
- Shadow Ball
- Slack Off
Not sure about the pokemon or the move passed here, but slack off makes eruption more viable, and unaware is helpful, and in general its been doing ok.
Walking Wake @ Life Orb
Ability: Protosynthesis
Tera Type: Water
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Agility
- Flamethrower
- Draco Meteor
- Hydro Steam
Really benefits from teammates here. Eruption and Sun does massive damage and I normally send it out fairly early, but later in the game it can benefit from recovery and water shuriken to do good damage.
Volcarona @ Heavy-Duty Boots
Ability: Flame Body
Tera Type: Bug
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Quiver Dance
- Fiery Dance
- Bug Buzz
- Giga Drain
Appreciates eruption, hydro steam, and shuriken, can win late game with those if you get a QD off. Giga drain is good coverage for the rest of the team and makes eruption more viable. Can sometimes save a game with flame body by burning a fast sweeper.
Rotom-Wash @ Leftovers
Ability: Levitate
Tera Type: Electric
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Volt Switch
- Discharge
- Will-O-Wisp
- Nasty Plot
Not sure about the moves here, sometimes nasty plot is nice but I don't end up using it much. Mostly end up using will-o-wisp and water shuriken later in the game.