Rayquaza will be available in Pokémon GO Raid Battles from July 31 to September 2. Shiny Rayquaza will also make its Pokémon GO debut on July 31 at 1 p.m. PDT. Read on below for all the details:

The Legendary Rayquaza Returns to Pokémon GO!

Get ready for raids that are out of this world! Starting July 31, the Legendary Rayquaza returns to Pokémon GO Raid Battles for a limited time. Prepare your teams, Trainers—if your luck soars sky-high, the Rayquaza you encounter may even be Shiny! http://bit.ly/2MnXxiQ

Rayquaza returns to raids with a radiant reveal!

Rayquaza will soon be available to encounter in the world of Pokémon GO!

If your luck soars sky-high, you may even encounter a Shiny Rayquaza!

🌬️ May the winds of fortune blow in your favor. Let’s GO!

https://pokemongolive.com/post/shinyr…

Il Pokémon leggendario Rayquaza ritorna in Pokémon GO!

Preparati a raid dell’altro mondo! Dal 31 luglio il Pokémon leggendario apparirà nuovamente nei raid di Pokémon GO, ma sarà disponibile solo per un periodo di tempo limitato. Prepara la tua squadra, perché potresti persino incontrarne uno cromatico! http://bit.ly/313qEvJ

Rayquaza returns to raids with a radiant reveal!

Trainers,

Rayquaza is said to have lived for hundreds of millions of years in the ozone layer, descending only to put the clash between Kyogre and Groudon to rest. Seeing as the Sea Basin Pokémon and the Continent Pokémon have both been active recently, it’s no surprise that this normally reclusive Pokémon has reappeared in their place!

Date + Time

Rayquaza will appear in five-star raids from Wednesday, July 31, 2019, at 1 p.m. until Monday, September 2, 2019, at 1 p.m. PDT (GMT −7)

Features

If your luck soars sky-high, you may encounter a Shiny Rayquaza!

This Dragon- and Flying-type Legendary Pokémon is weak to Ice-, Rock-, Dragon-, and Fairy-type attacks. In fact, Rayquaza has a quadruple weakness to Ice-type attacks, so be sure to have Pokémon with those attacks ready when going into battle!

May the winds of fortune blow in your favor. Let’s GO!

—The Pokémon GO team

Oh. We almost forgot. 🤭

If you’re lucky…you may encounter a Shiny Rayquaza!!!

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May the winds of fortune blow in your favor, Trainer. pic.twitter.com/iDN2sldskG — Pokémon GO (@PokemonGoApp) July 29, 2019

❗❗ Rayquaza will soon be available to encounter in the world of Pokémon GO! ❗❗https://t.co/uQBGoVf3BM pic.twitter.com/6EdbFJdheX — Pokémon GO (@PokemonGoApp) July 29, 2019

As a result… ✨ — Pokémon GO (@PokemonGoApp) July 29, 2019

As many of you know, there has been a recent uptick in activity from both the Sea Basin Pokémon and the Continent Pokémon over the past few months. It is said that it takes the power of a Legendary Pokémon like Rayquaza to put the clash between Kyogre and Groudon to rest. — Pokémon GO (@PokemonGoApp) July 29, 2019

Source: Official Pokémon GO blog