Question marks

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

• The ??? type, a type used in Generation II, III, and IV.
• A form of Unown.
• The Pokédex number of an obtained Pokémon not in a regional Pokédex in Generation IV, V, and VI.
• The ID number, OT name and National Pokédex number of a Pokémon Egg.
• The temporary name of Silver in Gold, Silver, and Crystal, before he is given a name by the player.
• The location of the player while inside of a truck at the beginning of Pokémon Omega Ruby and Alpha Sapphire.
• In Pokémon Mystery Dungeon: Explorers of Time, Darkness and Sky, missions with an unknown reward have the reward listed as ???.
• Uncaught Ultra Beasts are displayed as ???.

• Glitches:
  • ?, a glitch type in Generation I and the main type of PPkMnp' '.
  • ?????, a glitch Pokémon appearing in Generation II.
  • ??????????, another glitch Pokémon appearing in Generation III.
  • ????????, the item often held by ??????????.
  • ? (glitch Pokémon), a glitch Pokémon that was used as filler for old Unown data in Generation III.
  • ?????, a dummied out item in Generation I located at hexadecimal identifier 07, fan-named "surfboard".
  • ?????, a dummied out item in Generation I located at hexadecimal identifier 2C that does nothing.
  • The description of several glitch items, such as Teru-sama.
  • MissingNo.'s classification in the Pokédex.