The Spotlight Hour in Pokémon Go is a weekly event that will highlight one, special, surprise Pokémon.
For one hour, the chosen Pokémon will appear more frequently in the wild, allowing you to catch as many as you can. This could help you fill in a missing entry in the Pokédex or find a strong Pokémon for raiding.
Due to the chosen Pokémon being a mystery and the power of time zones, we won't know which Pokémon has been chosen until the morning UK time on the day of the Spotlight Hour.
Like the established Community Day event, Spotlight Hour is designed to get players out playing Pokémon Go as part of a community.
On this page:

If you're after more weekly events, there is also Raid Hour on Wednesdays and the Mystery Bonus on Thursdays.

Pokémon Go's next Spotlight Hour: Time and featured Pokémon explained

Here's everything you need to know about the next Spotlight Day:
Featured Pokémon: Increased spawns for everything
Date: Tuesday, February 11th
Time: 6pm to 7pm local time
How useful is increased spawns?
The third Spotlight Hour appears to work a little differently, increasing the spawns of every Pokémon, not just one type as with previous weeks.
This means you should see Pokémon everywhere, as an early look on reddit suggests, without having to make much effort to explore - so even if you don't want to leave the house, it might be worth opening the app to see what's nearby.
There doesn't appear to be anything particular rare appearing more often, so just use it as an opportunity to catch more of... anything and everything. If you are planning to take advantage of the hour, then putting on a Star Piece is not a bad shout.

Pokémon Go in 2020 continues to add new features, such the arrival of the Go Battle League - which is currently highlighting the Ultra League - and soon, Clone Pokémon. We've also recently had the Buddy Adventure feature, which introduces a variety of perks - including finding Souvenirs - as well as a new trade evolution feature. 2019 saw the release of the first Gen 5 Pokémon, along with new regional exclusive Pokémon, Egg charts, and the introduction of the Unova Stone. Pokemon Go also sees regular events - including weekly Spotlight Hour and Mystery Bonus evenings, monthly Field Research rewards and Pokémon Go Community Day, plus a new Giovanni counters quest - the latest being A Professor's Work Is Never Done.

How to prepare for a Spotlight Hour in Pokémon Go

If you're planning on taking part in a Spotlight Hour, then there's a couple of ways you can prepare for the event.
The first is to ensure that you have enough Poké Balls and berries. You only have an hour to catch as many of the chosen Pokémon as possible - you don't want to waste it spinning PokéStops.
The second is to ensure that you have space left in your Pokémon Storage Box. Just like with items, you don't want to waste some of the Spotlight Hour transferring unwanted Pokémon, especially if you're planning on catching a lot of Pokémon.
Third and finally, it's worth checking to see if you have any spare lures. Using a lure will increase the amount of Pokémon you encounter in the wild for half an hour, so, if you use one during the Spotlight Hour, it should also help you encounter more of the mystery Pokémon.

Previous Pokémon Go Spotlight Hour Pokémon

So you have an idea of what to expect in future, here's a list of all previous Pokémon Go Spotlight Hour Pokémon since the feature's debut in February 2020:
  • February 4th - Onix
  • February 11th - Spoink
If you're after more weekly events, there is also Raid Hour on Wednesdays and the Mystery Bonus on Thursdays.