Pikachu with Red,Orange and Yellow colour ballon is only available in Okinawa. Source: https://pokemongolive.com/post/air-adventures-okinawa/ : r/TheSilphRoad
Pokemon 5 Balloon Centerpiece/Bouquet
Amazon.com: Anagram International 2946001 Pikachu Shape Balloon Pack, 31", Yellow : Toys & Games