Pokémon Go Tour: Sinnoh is heading to Los Angeles in February before opening its Diamond and Pearl-centric content up to players globally. This means you have several sets of dates, times, and event content to keep up with—including what Pokémon, research, and more are included for both iterations.
A lot of content from Go Tour: Sinnoh – Los Angeles will carry over to the global version when it runs, but there are likely going to be some key exclusions like available research and event bonuses. Certain things like the new Masterwork Research will also cost extra for players in the global event, but there is a clear reason for that. If you do plan on participating in either version of Go Tour: Sinnoh, here is a full content guide and event schedule for both, updated as Niantic provides more information.