This particular version Pokemon Jade is a hack of Keitai Denjuu Telefang: Speed Version. Its version counterpart is Pokemon Diamond (not related to the official Nintendo DS title), which is a hack of Keitai Denjuu Telefang: Power Version. The game features slight changes and Engrish dialougue.
Pokemon Jade with Pocket Monsters subtitle.
A 2-in-1 cart with Pokemon Diamond.
Another 2-in-1 featuring different artwork.
Box of the Spanish version.
GBA version; likely a small GBC board in the case.