It's the Pokémon Stadium of Digimon... or at least so i expected. This game essentially lets you transform your PocketStation into a v-pet that can hold 6 digimon at a time. I've never really owned a v-pet and i must say this one is rather nice, being able to talk to your mon, battle or Jogress evolve with another pocketstation v-pet, and go in a small RPG mode of sorts where you move across File Island and fight wild mons to unlock Museum unlockables, but there's not much to do on the game itself. Just look at unlockables like FMVs or Digital World lore, manage your v-pets at Jijimon's House, or a Pokemon Stadium style arena mode either against CPU or another player with a pocketstation. Despite the name it's certainly not like a Digimon World game.

It's worth mentioning that around this time, Bandai was implementing a lot of interconnectivity between Digimon gadgets and games. You could actually use your Pocketstation with your V-Pet data to transfer it to some Digimon game in the Wonderswan through the infrared sensor, and also apparently for D-1 Grand Prix in Digimon World 2. You can also use your Pocketstation data from PDW in Digimon Tamers: Pocket Culumon to unlock every single museum item, but then it kinda feels like cheating and defeats the whole point of the adventure mode here.
It's nothing too noteworthy unless you're some sort of veteran hardcore Digimon collector, as in owning a Wonderswan and having played saturn "Digital Monster Ver. S" hardcore.