After capturing all 26 Unown in the Ruins of Alph or Solaceon Ruins, players are able to catch "!" and "?". In Gold and Silver versions, players need to talk to the scientist that gives them the "Unown Report" to unlock the special area.
Diamond, Pearl and Platinum versions of the game add a small cave that the player needs to journey through to obtain "!" and "?". At the end of the cave, they also receive a Rare Candy. The ruins are the only areas in the Pokémon games to contain Unown, and players need to visit each room to catch them all.