Pokémon Go ‘Primal Rumblings’ event, Collection Challenge guide
From Feb. 22-24, Pokémon Go is holding a precursor to the big Hoenn event, upping the spawn rate of the Hoenn starters and bringing back Rayquaza in raids.
This article references relevant content from the polygon.com website. Original article link: [https://www.polygon.com/pokemon-go-guide/2023/2/22/23610324/primal-rumblings-event-collection-challenge-rayquaza-spawns]

Ahead of the global Pokémon Go Tour: Hoenn event, Niantic has launched a “Primal Rumblings” event to bring Rayquaza out of retirement and increase the spawn rates on Hoenn starter Pokémon. The event runs from Feb. 22-24.
Throughout the event, there’s also doubled XP from evolving Pokémon and an Absol spawn boost at noon.
Rayquaza caught during this event will have the new Charged Move, Breaking Swipe, which has been analyzed as being better (in some cases) than Outrage on it. It’s not worth wasting Elite TMs to grab, but if you’re raiding anyway, you might as well keep the move.
Below, we list out all the event perks, including the Collection Challenge.
Pokémon Go Primal Rumblings Collection Challenge
Catch the following:
Evolve the following:
Rewards: 10 Ultra Balls, 1 Rocket Radar