Lets bring it back

Stop.

Someone simulated it, and Tropius surprisingly solos as far as we know in 1v1, it broke the sim with how long it survived. Wolfe Glick did something similar back in the Sword/Shield era, where he used a 905v1,000,000,000 format, and Kyogre wins because of how many Pokemon learn Helping Hand.

What a very unique discussion that has never been annoying! /sarcasm

Genuine opinion:

(This question has always been extremely annoying, stupid, and pointless in my opinion. There are no rules so everyone just changes them to be "whatever gives the team I choose an advantage," meaning there is no way people will agree on an answer and the argument is endless.

"Magcargo's 91664913981792° degrees hot, the lions will all die of the heat!" "No, we're talking about video game logic!" "Okay, the Pokémon can just use moves that target multiple opponents and attack all the lions!" "But we've never seen those moves target more than five Pokémon!" "But Arceus is literally god and also (Insert Legendary/Mythical Pokémon here) also exists" "But Video Game logic" "WE'VE NEVER FOUGHT A LION OR 1 BILLION OPPONENTS IN THE VIDEO GAMES BEFORE SO WHAT DO YOU EVEN MEAN BY VIDEO GAME LOGIC" "BUT 1 BILLION IS A LOT OF LIONS, THE POKÉMON WILL ALL USE STRUGGLE UNTIL THEY FAINT" "BUT WHAT ABOUT DIFFERENT FORMS, SPINDA HAS LIKE 8 BILLION VERSIONS" "ONLY ONE OF EVERY POKEMON"

And it's all just pointless and a waste of time because the two sides will never agree and will continue pulling rules and arguments out of nowhere for way too long.)