They've release the schedule for when the other Hat Pikachu codes will be available
here.
Original Cap: in the stream earlier, code P1KACHUGET
Hoenn Cap: anime episode on October 2nd starting 18:55 JST
Sinnoh Cap: anime episode on October 9th starting 18:55 JST
Unova Cap: anime episode on October 16th starting 18:55 JST
Kalos Cap: Pokenchi on October 18th starting 08:00 JST
Alola Cap: anime episode on October 23rd starting 18:55 JST
World Cap: anime episode on October 30th starting 18:55 JST
I Choose You! Cap: TBA