From Bulbapedia, the community-driven Pokémon encyclopedia.
** To not have an [[Elite Four]].
*** A similar role is fulfilled by the Champion Cup.
Only be on the Switch(Kanto , the location of Let's GO, is also on Gameboy and the DS).
** To contain no settlements that end in "Town" or "City" in their English names.
** To introduce no [[Mythical Pokémon]] at the time of its release.