Thanks for the question.
I’m not exactly sure what ‘nature spirits’ are in this context but I’m certainly familiar with Pokémon. As Indigenous people, we believe that all things both inanimate and alive hold a lifeforce or energy, especially the land we occupy – in this way, I think I know what you mean by nature spirits. I’m not sure though that Pokémon has anything to do with Native Culture, or at least I haven’t heard of any connection as a fan of Pokémon myself.
Here’s a similar question though that was asked about spirits, perhaps it could be helpful in answering your question: https://www.wernative.org/ask-auntie-questions/could-spirits-be-trying-to-tell-me-something-im-not-native-american-as-far-as-i-know-but-things-keep
Thanks for writing in!