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Ultra Beast or legendary you find at the bottom of Lake Michigan's counterpart that has the motif of a lot of zebra mussels. I'm not quite sure how to make it distinct from Barbaracle and Stakataka. Maybe no visible sensory organs and having dazzle camo. I guess it would make sense since there is an Ultraman alien called Dada which has a similar look.
Generally, I'd want to emphasize forests and wetlands. There are a lot of neat things that you can find in there, so lots of your early game normal/flying/bug/grass/water types should be available, doing life things. I wonder if constricting player movement to small spaces that might require crouching to pass would be viable. Abandoned buildings also seem like an environment that hasn't been used much. Most in Pokemon are haunted houses with Alola being the real exception, but a factory or water mill or something that is now rustic and having moss overtaking parts would be a distinct feeling. Maybe holes in the ceiling let light through in the day and at night the moon's reflection causes beautiful lighting.