Don't really understand what you mean with "so im just asking my gba games get stored on the Vi"
but i give it a try.
EZVi = Can play NDS roms and GBA roms, but to be able to play the GBA roms you need to have a EZ 3 in 1. I think but im not sure that you can store your GBA games on your EZVi and only run them witht he 3 in 1 inserted and the games should start up.
Or
Get a DSTWO, it can play both GBA and NDS roms and soon also SNES roms.