This is the Japanese version of the combined Mother 1 + 2 games, which means it is in Japanese. This ROM (Read-Only Memory) would be used to play the game on an emulator or a flashed GBA system.  The gameplay remains the same as the English translation, however the language barrier prevents players unfamiliar with Japanese from understanding the story and dialogue.

Mother 1+2 (J)(Trashman)

Mortal Kombat Advance (E)(GBANow)