All the Final Fantasy Advance games are available on the Gameboy Advance. Not exactly the same, there are some changes from Final Fantasy II (the US name). There was a Wonderswan Color port of the SNES game (Wonderswan Color is Gameboy Color, however that port never made it to the US) which featured some enhancements. The GBA version, the one that we're talking about, is largely a port of that Wonderswan Color version with further enhancements.
http://en.wikipedia.org/wiki/Final_Fantasy...ame_Boy_Advance
There appears to be a plan to remake it completely for the DS as well.