I know it's Advance, I think the article originally had Advanced, which has now been fixed, although I didn't sleep last night so I may have been imagining it.
Original GBA (no backlight unless you modded it)
GBA SP (clamshell and backlight)
GBA Micro (with backlight)
There was no GBA2, everyone thought the DS was going to be called the GBA2, but Nintendo dropped the GameBoy name, even though the DS was originally 2x GBA's welded together, later changing the 2x ARM7's (GBA processor) to an ARM7 and an ARM9 for the production hardware.
Still got my Mario edition GBA Micro that I picked up in Akihabara years and years ago so I can play Advance Wars, great machine, probably the most perfect handheld I have ever owned.