After defeating the Elite Four, you'll gain access to the Sevii Islands, a new region with unique Pokémon and challenges. These islands are crucial for completing your Pokédex and unlocking further post-game content. You'll need to help Celio connect the islands to the Kanto region's PC system. Explore each island, battle new trainers, and discover hidden areas. This is where you can catch Pokémon not found in Kanto, like Murkrow and Houndour.
