There are two types of false types; placeholder types and hex:80+ types.
All have no weaknesses but glitch moves with are always 1× effective against other Pokémon.
Placeholder typesThe placeholder types are eleven "NORMAL" types with index numbers between 9-19 (hex:09-13), just before the Fire-type.
These types possibly exist because internally all types with IDs hex:14 and beyond deal special damage, and all types before hex:14 deal physical damage. As there are less than 19 physical types these types occupy unused spaces.
Hex 80+ typesThe hex:80+ types are 27 types with index numbers between 128-154 (hex:80-9A). There is one hex:80 type with the name of every real type each, and eleven additional "NORMAL" types.
These types exist for a different reason; the name pointer for the types are taken from that of the type modulo 128, rather than what would be the name pointer.
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