There's a fun little April Fools' Day event called "What's That Poké Ball?" in Pokémon Go today that runs until midnight (local time). The in-game description of the event is simply, "Poké Balls are appearing on the map!"
Pokemon Go's Fuzzy Buddy Research Day takes place on Saturday, March, 29, 2025, from 2:00 p.m. to 5:00 p.m. local time. The event is ideal if you're trying to evolve or get a Shiny version of the Featured Pokémon.