In order to progress we needed a Pokémon that can learn surf. We had 5 of our 6 Pokémon slots full, so if we bought, caught, or obtained a Pokémon, it would go into that sixth slot. Eevee if evolved into Vaporeon works. Or we could be given Lapras which works. Or they could catch a Pokémon which is super hard to coordinate with 70k users. If eevee evolved into a non surf learning pokemon, we'd have to go to the pokemon PC to get a surf pokemon out of storage.
We picked Eevee, evolved it into the flareon, tried to go to the box, and released two of our pokemon, including a starter, and deposited the helix fossil, which is being revered as a sort of God. If we didn't go with Eevee, we may still have our two released pokemon and our God. Instead, the false prophet killed them.