Scolipede @ Waterium Z
Ability: Speed Boost
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Aqua Tail
- Poison Jab
- Megahorn
- Swords Dance

Greninja @ Choice Specs
Ability: Battle Bond
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Dark Pulse
- Hydro Pump
- Water Shuriken
- U-turn

The whole purpose of this core is to abuse Lando-T + Tapu-Fini based cores (as already mentioned). Greninja tends to draw in Tapu-Fini letting you pivot out into Scolipede to get a free swords dance. You can then either blow back Tapu-Fini or Lando-T (with waterium-Z) and proceed to weaken most of the opponents team to get the best transformation opportunities for Ash-Gren.

This core struggles a bit with Toxa / spdef Skarm (celesteela); So Tapu-Koko is great addition and completes a volt-turn core.