A Colossal Discovery

A Colossal Discovery is an event featuring return of the Legendary Titans: Regirock, Regice, Registeel and the debut of Regigigas in Pokémon GO. Regigigas Special Research and some parts of the event required purchasing a ticket to unlock.

Features
The Legendary Titans reappeared in tier 5 Raid Battles. Certain Ice-, Rock-, and Steel-type Pokémon were more frequently seen in wild and Eggs. The effectiveness of Egg Incubators was doubled.

Featured Pokémon
Following Pokémon had increased spawn rates in the wild:

Moreover, these Shiny Pokémon were released with the start of the event.

The following Pokémon hatched more frequently from Eggs during this event. Some of them were not available in the normal egg pools.

The following Raid Bosses were available for a time of this event. On November, all Raid Eggs only took 15 minutes to hatch, and the Raid time was extended to 90 minutes. The frequency of Legendary Raid was also sharply increased.

Shop special offer
The following offers were available from the shop from the start of the event.

Ticket-exclusive features
Trainers could purchase the ticket which enabled them to receive the Special Research tasks series – A Colossal Discovery if they turned on the game during local time 11 a.m. to 7 p.m. on November, 2019.

The rewards included:
 * Exclusive Field Research
 * Special Research – A Colossal Discovery: gain access to Regigigas, Sinnoh Stone, Unova Stone and more.
 * A Colossal Discovery medal
 * 10 additional Raid Passes at no cost during the Special Research time period when Trainers spun a Photo Disc at a Gym. These Raid Passes would not be available after the event period was over. Trainers could not hold more than one Raid Pass at once.
 * An exclusive avatar pose

Ticket details:
 * Sold US$7.99 (or the equivalent in your local currency) and could be purchased directly from the shop. The ticket could not be purchased with PokéCoins.
 * Tickets could be purchased until Saturday, November, 2019, at 5 p.m. in your local time zone.

Field Research event tasks
There were several Field Research tasks available exclusively to the ticket holders for the duration of the event.

Special Research – A Colossal Discovery
Text in italics indicates changes of task after the event ended.

First part:

Second part:

Third part:

Fourth part: