The game focuses on snagging Shadow Pokémon and returning them to their original form, not on traditional purification.
Here's how the process works:
1. Snag a Shadow Pokémon: You encounter Shadow Pokémon in the game, and you need to capture them using the "Snag Machine."
2. Train and Build a Bond: You train your Shadow Pokémon and build a bond with them. This is done through battling and using items.
3. Purify with the Purify Orb: Once a Shadow Pokémon has reached a high enough bond level, you can use the Purify Orb to restore their true form. This removes the Shadow Pokémon's dark aura and restores their original stats and appearance.
So, instead of "purifying" Pokémon, you're essentially releasing them from their shadow form.