The chip was found to be the E0C88V20 which was never actually advertised on their website as part of the family but the community found a description file in the epson toolchain that almost matched the PM completely. Seiko created many different chips in the S1C88 family which all have different configurations so to find out what specific chip the Pokemon Mini used required some investigation.
The hardware for the Pokemon Mini was provided by Seiko EPSON which included a 8-bit CPU called the S1C88, it was a cpu that was commonly sold for small portable devices such as watches or pedometers. Unlike previously thought, Nintendo did not actually create custom hardware for the Pokemon Mini, as it was recently found out that the CPU is actually a standard Seiko model that was previously used to power similar devices with small LCDs. Pokemon Mini Official Software Development Kit (Toolchain) Edit on Github
