unknown_64390 is Parts

[ishax-kos]

the files in
data/unknown_64390/
are parts that you equip and determine how much ram you have for software

// 24 bytes
struct Part_data_japan {
    char[8] name; // 8 bytes
    ubyte compatibility; // 1 byte
    char[6] affix; // 6 bytes
    ubyte ram; // 1 byte
    ubyte attack; // 1 byte
    ubyte defence; // 1 byte
    ubyte speed; // 1 byte
    ubyte[4] unknown; // 4 bytes
    ubyte animation; // 1 byte
}