>>55781965These kinds of questions depend a lot on the exact specifics, how you think it works and how seriously you take it.
Like most people, I think the Pokémon win. Arceus and some other Pokémon could kill all the lions on their own if they wanted. But I'll take it a step further.
I think not only do the Pokémon win, but also that not a single Pokémon will die. I think every Pokémon could easily beat a lion in a 1V1. If we evenly divide the lions to each Pokémon, then some will fail, because not all Pokémon can handle 975609.756098 lions. But then that's 1025 separate fights, not one single fight. In a big team fight like this, the weaker Pokémon can stay back and help using Moves like Helping Hand.
Remember that Pokémon Battles are a standardized way for Pokémon to fight and don't result in death. A weak Level 1 Pokémon is hit by a strong Move from a Level 100 Legendary and simply faints, suffering no permanent injury. So Pokémon are extremely durable. Yes, in the anime we see humans surviving some attacks from Pokémon, but that's because of cartoon gag logic and the fact that humans in the Pokémon universe evolved differently from humans in real life.