eevee.zip was an archive leaked to /ppg/ on Christmas Eve, 2020, alongside t210_t214_brom.7z, which was leaked on the same day. This archive contained an NSP file called beluga.nsp, which was a prototype build of "Pokémon: Let's Go, Eevee!" for the Nintendo Switch. The build was dated May 12th, 2018, meaning this was from six months before the game's official release. This prototype contained a debug menu, unused sprites, unused music, test maps, and placeholder text.[1]

eevee.zip
Eevee proto.jpg
The title screen from the May 2018 Let's Go Eevee prototype, with minor differences, and a debug menu.
Filenameeevee.zip
Date leakedDecember 24, 2020
OriginZammis Clark Breach
TypePokémon, Pre-release
Filesize8.6 GB (8,671,417,165 bytes)
Relevant consolesSwitch
Extracted filesize8.7 GB

The size of the build totaled 8.7 GB when decompressed, which is more than twice the size of the game's release build.