The video game is a remake of Pokémon: Yellow Version - Special Pikachu Edition (1998) and prequel of Pokémon Ultra Sun (2017).
The other female character named Green this based on her counterpart from the manga of Pokémon Adventures.
The original characters Red and Blue from the original video games appear as challengers Pokémon trainers.
The main characters are Chase and Elaine.
The main rival is Trace.