Question marks

Question marks are often used to indicate things in the Pokémon games that are unknown:

• The Unknown type, displayed in-game as File:UnknownIC.gif
• An actual form of the Pokémon Unown
• The Pokédex number of an obtained Pokémon not in the regional PokéDex
• The ID number, OT name and National Dex number of a Pokémon egg
• Glitches:
  • Five question marks, a glitch Pokémon appearing in Generation II
  • Ten question marks, another glitch Pokémon appearing in Generation III
  • Eleven question marks, yet another glitch Pokémon appearing in Generation III
  • Question mark, a glitch Pokémon that was used as filler for old Unown data in Generation III
  • The description of several glitch items, such as Teru-sama