Pokédex Completion

As with most Pokémon games, Pokémon Pokopia has got a Pokédex to complete. This features 300 Pokémon requiring you to build habitats to get them to appear. As you complete your Pokédex, you will get various item rewards of recipes to create items

Once you have all 300 Pokémon, however, there's a special bonus to unlock.

Once you have crafted the Neo Dowsing Machine, Professor Tangrowth recommends you take it to the Sparkling Skylands. Go there and take a Pokémon with Search to the northwestern island. When there, you will start searching and the Pokémon will tell you when there is something beneath you. Dig down and you will find another scanner like the scanner at the gates.

Scan your Pokédex at the gate and it will unlock (if you have a full Pokédex). Inside is the developer room from Celadon City where you will get Recipes for a Printer, a shutter and a card reader, allowing for you to build rooms with similar locking mechanisms.

At the printer, you will be able to scan your Pokédex where a Diploma will be printed, which you can display wherever you want.