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

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