Units of computing data
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The term byte represents an ordered collection of bits, with each bit representing a binary value of either 0 or 1. In most modern hardware, the defined size of a byte is eight bits, hence by de facto standard there are 2^8 (or 256) distinct values in one byte.
In the Pokémon games, the smallest groups of identifiers can only be read by the console in single 8-bit bytes. This explains for example, the reason why there are 106 identifiers occupying glitch Pokémon recallable via the Ditto Trick in Generation I.