Ruined Kingdom is another world on the blog and is Heidi's homeworld. Things were a little different in the world and the world is technically 200 years ahead of time (i.e. the events of Pokémon Red and Pokémon Blue in that world occurred 200 years in the past).
The canon of the main games did not quite happen in this world from Generation IV onwards. Friede, the Arceus of the world, created an entire city within the Hall of Origin for people and Pokémon to live in; however, due to this, Team Galactic attempted to further their plans by attempting to subdue Friede herself. This event led to a downward spiral for both Friede and the city as a whole. Eventually, 100 years ago, Friede destroyed the world in the start of a crusade to purge the multiverse of humanity.
The world is a desolate land with only very few Legendary Pokémon remaining. Time does not flow, and space is only being maintained by Eden, the Palkia of the world. With Friede gone, it is not known how the world is still standing.
All Legendary Pokémon that originate from Ruined Kingdom only have human forms. Heidi is the sole known exception to this rule. It is not known why this is the case, nor why Heidi is the exception. In addition, while Legendary Pokémon from the Ruined Kingdom are technically catchable, all Pokéballs / Beast Balls that do not exclusively use Ruined Kingdom materials have only 10% of the intended catch rate. Heidi is the sole exception to this rule.