Character is the lolita fashion girl from the very first Japanese Pokemon Red/Green commercial:

https://www.youtube.com/watch?v=mjCK2D88bCs

Supposedly she was a celebrity called "Robin-chan" (ロビンちゃん). Can't find much else about her.

The main heroine from Gotcha! has a similar hairstyle, and when revealed some of the Japanese believed it to be a reference:

https://twitter.com/npeofnpe/status/1311072673783373825