The Pokémon Company has unveiled official Pokémon Let’s Go Pikachu and Let’s Go Eevee screenshots, details and gameplay footage for the special GO Park minigame in the Play Yard:
Challenge Yourself in the Play Yard
Once you have 25 of the same species of Pokémon in the GO Park complex, you’ll be able to challenge yourself to a special minigame in the Play Yard.
In the minigame, you’ll need to lead all the Pokémon into the goal area within the time limit.
The Pokémon will all be doing their own thing at the start of the minigame, but they’ll start following you once you get close enough to them.
Watch out for the obstacle Pokémon that appear from time to time, though. Bump into one of them, and the Pokémon you’ve been gathering will get surprised and run away!
If you manage to get all the Pokémon into the goal area within three minutes, you win! Your prize is Candies, which will prove invaluable as you put together your Pokémon team.
Source: Official Pokémon Let’s Go website and @Pokemon
Pokémon Blog 
Can you play the minigame with 25 Alolan form pokemon transferred from Pokemon GO? E.g. if I transfer 25 alolan ratata from Pokemon GO can I enter the play yard with them?
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