Trainers, keep your eyes on the size during Pokémon GO’s Sizeable Surprises event! From Thursday, April 4th, 2024 at 10:00 a.m. to Tuesday, April 9th, 2024 at 8:00 p.m. local time, enjoy some Sizeable Surprises in Pokémon GO!

Sizeable Surprises

Thursday, April 4, at 10:00 a.m. to Tuesday, April 9, 2024, at 8:00 p.m. local time

Event bonuses

• 2× XP for successfully catching Pokémon with Nice Throws or better.*
• Increased chance to encounter XXS and XXL Pokémon in the wild.
• Increased chance to encounter Shiny Wailmer!

**This bonus will not stack with the Catch XP bonus for April Community Day Classic.

Wild encounters

The following Pokémon will appear more frequently in the wild. Also, for the first time in Pokémon GO, you’ll be able to encounter Shiny Wimpod—if you’re lucky!

Diglett*
Mantine*
Wailmer*
Joltik*
Tynamo
Cutiefly*
Wimpod*
Cetoddle

Some Trainers might even encounter the following: Onix*, Snorlax*

*If you’re lucky, you may encounter a Shiny one!

Raids

The following Pokémon will appear in raids. Also, for the first time in Pokémon GO, you’ll be able to encounter Shiny Celesteela and Shiny Kartana—if you’re lucky!

One-Star Raids: Foongus*, Klink*, Espurr*, Tadbulb
Three-Star Raids: Alolan Exeggutor*, Galarian Weezing*, Gyarados*, Snorlax*
Five-Star Raids: Celesteela (Southern Hemisphere)*, Kartana (Northern Hemisphere)*
Mega Raids: Mega Charizard X*

*If you’re lucky, you may encounter a Shiny one!

Field Research task encounters

Event-themed Field Research tasks will be available! The following Pokémon will be available to encounter when you complete Field Research tasks!

Onix*
Snorlax*
Wailmer*
Tynamo
Cutiefly*
Wimpod*

*If you’re lucky, you may encounter a Shiny one!

Collection Challenges

Event-themed Collection Challenges are coming! Complete the Collection Challenges to receive Razz Berries, Pinap Berries, XP, and encounters with Wimpod and Wailmer!

PokéStop Showcases

Be on the lookout for Showcases at different PokéStops during the event where you can enter event-themed Pokémon!

Source: https://pokemongolive.com/en/post/sizeable-surprises-2024/