Lions vs Pokemon everyone
I think nobody has addressed the fact that there are Pokémon that have continental manipulative power
Just get Kyogre to drown them or Groudon to crush them.

So on average each Pokémon needs to take down 1000 Pokemon. Assuming the lions are pretty tightly packed a single Spacial Rend or Roar of Time will take down a few thousand. Oblivion Wing takes a few more. Thousand Arrows BY DEFINITION takes out at least a thousand.

So I think the Pokémon will win. There are a lot of lions but assuming the Lions and Pokemon start with some distance between them on either side of....idk a big field I think they can just pop ranged attacks, groudon can split the earth and Kyogre sweeps them all away.