Ok, hear me out. I'm not gonna say any of those *flip a coin until you get tails* stuff. This is something very elaborate that I came up with that could potentially allow you to deal infinite damage. Note: this is in unlimited format on TCGO.
Opponent's Field -
Bench:
Magnezone ULP
Zoroark GX SHL with DCE attached
Exeggcute PLF
Exeggcute PLF
Active:
Dialga & Palkia LEGEND TRI with 3 Metal Energy
Discard:
Doesn't Matter.
Deck:
1* Lileep, Anorith, Tirtouga, or Archen with Prehistoric Call.
Hand:
Doesn't matter.
Your Field -
Bench:
Zoroark GX SHL
Zoroark GX SHL
Zoroark GX SHL
Active:
Galvantula STS with any energy attached
Discard:
Doesn't matter.
Deck:
3*Lileep, Anorith, Tirtouga, or Archen with Prehistoric Call.
Hand:
Iris
Field -
Stadium: Mt. Coronet
How this works -
Every other turn use Mt. Coronet + Magnezone to set up a Dialga & Palkia LEGEND to use Sudden Delete. Every time Dialga uses Sudden Delete, use Galvantula's attack to KO the two benched Exeggcutes. Every turn use Trade on the Prehistoric Call Pokemon, and use Prehistoric Call when you've traded all of them into the deck, meaning one if 2 are in prizes, 3 if none are in prizes from Sudden Delete. The Prehistoric Calls + Zoroarks allow for the game to last infinitely, but the addition of the Magnezone and Dialga & Palkia allows for the Galvantula to continuously be taking prizes. Thus, after taking an infinite amount of prizes, you can use Iris and simply use Riotous Beating from one of the Zoroarks to deal an infinite amount of damage.
Do correct me if I'm wrong or confusing about some things,
Opponent's Field -
Bench:
Magnezone ULP
Zoroark GX SHL with DCE attached
Exeggcute PLF
Exeggcute PLF
Active:
Dialga & Palkia LEGEND TRI with 3 Metal Energy
Discard:
Doesn't Matter.
Deck:
1* Lileep, Anorith, Tirtouga, or Archen with Prehistoric Call.
Hand:
Doesn't matter.
Your Field -
Bench:
Zoroark GX SHL
Zoroark GX SHL
Zoroark GX SHL
Active:
Galvantula STS with any energy attached
Discard:
Doesn't matter.
Deck:
3*Lileep, Anorith, Tirtouga, or Archen with Prehistoric Call.
Hand:
Iris
Field -
Stadium: Mt. Coronet
How this works -
Every other turn use Mt. Coronet + Magnezone to set up a Dialga & Palkia LEGEND to use Sudden Delete. Every time Dialga uses Sudden Delete, use Galvantula's attack to KO the two benched Exeggcutes. Every turn use Trade on the Prehistoric Call Pokemon, and use Prehistoric Call when you've traded all of them into the deck, meaning one if 2 are in prizes, 3 if none are in prizes from Sudden Delete. The Prehistoric Calls + Zoroarks allow for the game to last infinitely, but the addition of the Magnezone and Dialga & Palkia allows for the Galvantula to continuously be taking prizes. Thus, after taking an infinite amount of prizes, you can use Iris and simply use Riotous Beating from one of the Zoroarks to deal an infinite amount of damage.
Do correct me if I'm wrong or confusing about some things,