Replay: Water Research Day was a Pokémon GO Research Day with 3 featured Pokémon. Here's what's actually worth your time, which bonuses to stack, and whether it's worth clearing your schedule for.
What to prioritise
This is more of a casual, collection-focused event than a competitive one — there's nothing here that'll shake up your raid or PvP roster, so play it for the shinies and the fun.
Shiny hunting
With 3 shiny forms in the pool, this is a solid shiny-hunting opportunity — increased spawns mean more checks per hour, so prioritise volume and don't skip the ones you already have.
Is it worth your time?
Optional, but nice for collectors. Nothing here is essential for your competitive roster, but the shiny odds and featured spawns make it a pleasant, low-pressure window. Note: this event has already ended — it's kept here for reference and for when it returns.