Sheen

All Pokémon initially have sheen of 0, except Pokémon received in in-game trades in the handheld Generation III games, which begin with a sheen of 10.

When a Pokémon eats a Pokéblock or Poffin, that food item's feel or smoothness is added to the Pokémon's sheen, up to a maximum of 255. In Pokémon HeartGold and SoulSilver, having the haircut brothers or Daisy Oak groom a Pokémon also increases its sheen. If a Pokémon's sheen would exceed 255, it becomes 255 instead (the Pokémon's condition is still increased as normal).

A Pokémon with 255 sheen cannot eat any more Pokéblocks or Poffins in the Generation III and IV games. Sheen is permanent and cannot be decreased or reset. Therefore, a Pokémon can be fed more Pokéblocks or Poffins that have low smoothness.

Although the sheen value remains in the internal Pokémon data structures from Generation V onward, it has no effect in Pokémon Omega Ruby and Alpha Sapphire, as Pokéblocks applied in Generation VI neither affect nor are affected by sheen.

In Pokémon Brilliant Diamond and Shining Pearl, Sheen is taken into account. Poffins once again increase Sheen when fed to a Pokémon, and Sheen restricts the amount of Poffins a Pokémon can consume.

Sheen is displayed on the same screen as a Pokémon's condition, located in the PokéNav in Pokémon Ruby, Sapphire, and Emerald and the Pokémon's summary screen in Pokémon Diamond, Pearl, and Platinum, as a series of sparkles.