Sinnoh is Pokémon generation 4 in the National Pokédex, covering species #387–#493. Dialga is the legendary most collectors associate with the region. Collectors working era-by-era often start here because the list is finite (107 species) and easy to compare against binder progress.
Unlike video-game Pokédex tools that track regional forms, Gigantamax, or variant slots, Pokédex Checklist is species-first for TCG binders: one tick per Pokémon. Use this page to see the full Gen 4 list, mark what you already own, and open the main checklist filtered to Gen 4 when you want search, export, and cloud sync.
Premium unlocks all 1,025 species, cloud backup across devices, leaderboard ranking for this generation, and Hall of Fame eligibility when you complete the full National Pokédex, not just Sinnoh.
Prefer the full app? Open the National Pokédex checklist with search, CSV export, and optional card metadata per species.