Adamant Custap (Torterra) @ Custap Berry
Ability: Overgrow
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Wood Hammer
- Earthquake
- Swords Dance
- Endure
Custap is good if the opponent doesn't know your set. With prediction, you can beat Magearna, Greninja, Tapu Lele, Meloetta, Choiced Victini, Z Heatran, and Ground Z / Scarf Landorus-T.
You also beat Mega Gyarados, Mega Slowbro, Zeraora, Electrium Z Magnezone, SpDef Mega Mawile, and Z Primarina + Tapu Fini (outside of random Ice Beams) without any prediction necessary.

Impish Custap (Torterra) @ Custap Berry
Ability: Overgrow
EVs: 204 HP / 164 Atk / 140 Def
Impish Nature
- Wood Hammer
- Earthquake
- Swords Dance
- Endure
You can also run this EV spread to beat all Mega Mawile reliably, although it takes away from Torterra's power.

Impish Stall (Torterra) @ Normalium Z Kee Berry
Ability: Shell Armor
EVs: 252 HP / 252 Def / 4 SpD
Impish Nature
- Tickle / Curse
- Amnesia
- Synthesis
- Seed Bomb
Norm Z + Tickle lets Torterra beat Z Dragonium Dragonite more reliably, while Kee + Curse beats Sub users like Zygarde-C and (non Ice Punch) and Mega Metagross.
You can also run SpDef to do better against Meloetta and SubTorrent Greninja.
https://www.smogon.com/forums/threads/1v1-old-gens.3646875/page-29#post-10655850