This is exactly what it says: every single Pokemon cry from the X and Y generation, starting from Bulbasaur and running through the full Kanto roster and beyond. These aren't music tracks, they're sound design artifacts.
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Each cry is a tiny piece of audio engineering, compressed and pitched to give 700+ creatures their own voice within the hardware's limits. The 3DS-era cries are noticeably cleaner and more detailed than the originals, with actual animal-like qualities emerging (Charizard's roar, Pikachu's iconic squeak).
Hearing them lined up in Pokedex order is oddly satisfying, like flipping through an audio encyclopedia. If you're a Pokemon sound nerd or need reference files for a project, this is the definitive collection.