Niantic has announced that from Tuesday, May 21st, 2019 until Tuesday, May 28th, 2019, players of Pokémon GO can participate in an Extraordinary Raid Week.

Jump-start your summer with Extraordinary Raid Week!

Trainers, Get ready for the summer with a special week of events! Prep your best teams, and get your Raid Passes ready for our upcoming Extraordinary Raid Week. To test your battle skills, we have a full week of exciting raids for you to show off your Trainer prowess.

Extraordinary Raid Week

Date + Time

• Tuesday, May 21, 2019, at 1 p.m. to Tuesday, May 28, 2019, at 1 p.m. PDT (GMT −7)

Raids

• ★: Machop, Slakoth, Shinx, Bronzor
• ★★: Misdreavus, Kirlia, Mawile, Feebas, Clamperl, Bibarel
• ★★★: Alolan Raichu, Chansey, Scyther, Aerodactyl, Floatzel
• ★★★★: Alolan Marowak, Dragonite, Tyranitar, Absol, Metagross

Features

• If you’re lucky, you may encounter a Shiny Bronzor!

Bonuses

• 2× Raid Stardust
• 2× Raid XP

Raid Hour
Date + Time

• Wednesday, May 22, 2019, 6 p.m. to 7 p.m. (local time)

Features

• The number of raids of all levels will increase during the event hour.

Lapras Raid Day
Date + Time

• The Americas, Greenland, Europe, the Middle East, Africa, and India: Saturday, May 25, 2019, 11 a.m. to 2 p.m. (local time)
• Asia-Pacific: Sunday, May 26, 2019, 11 a.m. to 2 p.m. (local time)

Features

• The Transport Pokémon, Lapras, will be joining Raid Battles for this event.
• Receive up to five Raid Passes from Gyms at no cost.
• If you’re lucky, you may encounter a Shiny Lapras!

This is your chance to add some awesome Pokémon like Tyranitar or Metagross to your team. We hope you’re up for the challenge, Trainers! Let’s GO raid!

Source: https://pokemongolive.com/post/raidsonraidsonraids2019