Pokemon Brilliant Diamond National Pokedex Guide And Unlock Requirements

Pokemon Brilliant Diamond takes trainers back to the historic Sinnoh region, offering an adventure filled with diverse creatures and challenging battles. While finishing the main story line provides plenty of excitement, unlocking the National Pokedex opens up the true endgame experience. This upgraded guide allows players to track and capture hundreds of additional pocket monsters from previous generations.
Completing the Sinnoh Regional Pokedex
Before you can expand your horizons, you must first document every native creature residing within the local boundaries. Fortunately, the game only requires you to see all 150 unique entries in the Sinnoh index rather than catching them all. This means encountering a creature in a trainer battle or spotting it in the wild counts toward your progression goal.
Many players occasionally miss a few rare entries during their initial journey through the main story chapters. If you are struggling to locate the legendary box mascot from the opposing version, visiting an elder in Celestic Town will easily register the missing data. Defeating the Elite Four is also highly recommended, as their advanced teams showcase several uncommon species.
Meeting Professor Rowan and Professor Oak
Once your regional tracker is entirely filled, your next step is to travel directly to Sandgem Town to visit the local research laboratory. Speaking with Professor Rowan will trigger a special event where the legendary Professor Oak arrives to evaluate your hard work. After verifying your comprehensive data, Professor Oak will officially upgrade your device to the National Pokedex.
This major upgrade instantly expands your encyclopedia to accommodate over 490 unique entries from multiple distinct regions. Unlocking this system also grants you access to the Poke Radar, a valuable tool used for uncovering rare hidden species. Tracking your global milestones on an external platform can provide a great way to manage your massive collection over time.
Unlocking New Sinnoh Regions and Features
Obtaining the upgraded encyclopedia completely changes the post-game landscape by granting immediate access to previously restricted territories. Trainers can now board the ferry from Snowpoint City to explore the massive Battle Zone, which contains entirely new routes and dangerous dungeons. These high-level environments feature wild encounters that were completely unavailable during your initial adventure.
Additionally, the Grand Underground receives a massive update, causing rare legacy creatures to spawn within the various subterranean biomes. Legendary encounters also become available at Ramanas Park, allowing you to challenge and capture iconic beasts using special slates. This comprehensive expansion ensures that your journey continues long after your first victory at the Pokemon League.