What is an unobtainable Pokémon?

What is an unobtainable Pokémon? Like Mythical Pokémon, there are many Legendary Pokémon which are unobtainable in their shiny forms. In the most recent games in the series, Zamazenta, Zacian, and Eternatus are all unable to be caught as a shiny Pokémon without the aid of cheating.

Like Mythical Pokémon, there are many Legendary Pokémon which are unobtainable in their shiny forms. In the most recent games in the series, Zamazenta, Zacian, and Eternatus are all unable to be caught as a shiny Pokémon without the aid of cheating.
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