Random thought: It would be cool if there was a place like blueberry academy terrarium, but the school wasn't on top, maybe a lab (Possible Professor Ash AU), and it had Pokemon from all over the world. There would be three main sections, the first being the largest, a diversified biome for every Pokémon from across the world minus Legendary Pokemon, Ultra beasts, and Paradox Pokémon. The second area would be a place for just Ultra beasts, each having a biome based on their worlds. The final area would be for Paradox Pokémon based on the great crater of Paldea. Legendary Pokemon might show up just to say hi to Ash (Chosen One after all). Ash would also possibly have a main battle area for himself and visitors, specially equipped with teck to allow Dynamax/Gigantimax, and Terrastalize (Allowing him to further study Pokémon). If Game freak gives us another new type of Pokémon, a new area would be made for those specific Pokemon.