Ultra Bonus Event 2018

Ultra Bonus Event was an event in Pokémon GO that was given to Trainers after their completion of Global Challenge. It featured a series of action-packed rewards about the Kanto Pokémon.

Features
Pokémon originally discovered in the Kanto region were seen more frequently. Kanto-themed Raid Bosses are featured, including return of the Legendary Birds and the first time to challenge Mewtwo in normal Raid Battles. Region-exclusive Pokémon from Kanto with addition of Tangela and Porygon were added to the 7-km Eggs, so Trainers have the perfect opportunity to complete their Kanto Pokédex.

On September, Niantic announced to extend regional hatches to October.

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

Raid Bosses
The following tier 1 to 4 Raid Bosses are available for a time of this event. The Legendary Birds were available from September to September, and Mewtwo come after them until October. Other than Regirock, other Raid Bosses were replaced by Kanto Pokémon.

During the Legendary Birds period, all Raid Eggs only took 15 minutes to hatch, and the Raid time was extended to 90 minutes.

Shop special offer
There were three phases of special offer in the shop. The first set was available from September to September, 2018, focusing on hatching 7-km Eggs.

Starting on September, 2018, there was the second set focusing on Mewtwo raid.

Starting on October, 2018, the last set of boxes were available.

Trivia

 * It is one of four events that revolved around the Kanto-region Pokémon in particular, the other ones are Kanto Celebration, Let's Go Celebration and Pokémon Day 2019.