While there is no official mobile version of developed by Nintendo for Java-enabled phones, various fan-made versions and "demakes" exist in the .jar format for the classic 240x320 resolution. About Pokémon Ruby Java Versions

app is the gold standard, offering virtual keyboards and screen scaling.

Perhaps the most defining characteristic of the Pokémon Ruby Java experience was the audio—or lack thereof.

Saving was often via password codes rather than save files. Music was basic MIDI or silent.

: Community-driven repositories on Reddit's r/J2MEgaming often host links to full libraries of fan-translated Pokémon Java games.