Narratively, bringing Detective Pikachu back for a sequel would seemingly require more work on Ryan Reynolds’ part. His talking Pikachu has been transformed back into his human form, opening up for him to appear more in live-action in a potential follow-up movie. But Reynolds is also a super busy actor with a thriving career, so timing would have to work out. Additionally, Justice Smith is set to appear in Jurassic World: Dominion, but it’s unclear when that movie will kick production back up.
Article source: https://www.cinemablend.com/news/2493450/pokemon-fans-are-getting-more-detective-pikachu-but-not-how-youd-guess