DexNav different crown colors
A crown emblem may appear in the upper right of the DexNav, to indicate the player's progress.
- Platinum: all of the wild Pokémon in the area are in the player's Pokédex;
- Gold: the only missing Pokémon are foreign species unlocked by the defeat of Groudon/Kyogre;
- Silver: the player is missing Pokémon from only one of the other encounter methods (tall grass, fishing and surfing);
- Bronze: the player is missing Pokémon from two of the other encounter methods;
- No crown otherwise.
Source: Bulbapedia.