Pokémon GO Park

Pokémon GO Park was a Japanese regional event hosted in from August 9, 2017 through August 15, 2017 during the Pikachu Outbreak event.

Features
The event was held at the Cup Noodle Museum Park and and various facilities around the  area. There was a Pikachu Carnival Parade held on the second-to-last day on August, 2017. A Pokémon GO Stadium event occurred on this day as well.

Niantic stated that this event will offer a unique Pokémon GO experience.

Featured Pokémon
The event featured the region-exclusive Pokémon Mr. Mime. There were A, H, K, M, O and Y forms of Unown spawning very frequently at the event. These letters spell "Yokohama" - location of the event.

Selected Pokémon would have increased spawn rates in the wild (and from Incense, Lure Module).

These Shiny Pokémon would be released with the start of the event:

The following Raid Bosses would be available in Yokohama, Japan for a time of this event:

Locations
There were two areas in Yokohama that were transformed to into both the Kanto and Johto regions from the original game series.

Red Brick Park
The Akarenga area was transformed into the Kanto region. Pokemon from the Red, Green, Blue, and Yellow versions of the game appeared more frequently.

Cup Noodle Museum Park
This park was transformed into the Johto region. Pokemon from the Gold and Silver versions of the game appeared more frequently.

Reception
Over 2 million fans celebrated Pikachu Outbreak in Yokohama the week of the event. Trainers captured over 120 Pokémon and 15 million of those Pokémon were Pikachu. Unlike what happened at Pokémon GO Fest, cell signal and data speeds rarely hindered anyone's ability to play the game.