Mobile device version:
Your Pokémon's 'Sheen' and Super Contest Condition can only be viewed if the last game the Pokémon was moved from was Pokémon Brilliant Diamond or Pokémon Shining Pearl.
If you want to check your Pokémon's `Sheen' or Super Contest condition, you can do so by moving it back and forth to Pokémon Brilliant Diamond or Pokémon Shining Pearl one more time.
Nintendo Switch version:
Sheen and Super Contest condition of a specific Pokémon can only be viewed when Pokémon HOME data is currently connected to existing Pokémon Brilliant Diamond and Shining Pearl save data