Armed with the info you guys posted I trawled through a bunch of Chinese wholesalers and noticed a trend; apparently a bunch of them get their pirate GBA carts from the same factory as they've all got more or less the same inventory list along with the same game ID's that correspond to the titles.
I noticed that virtually every list has the same titles marked with some type of symbol, and several of these are obviously just PocketNES or are a GBC game reprinted with a GBA PCB and shell. However, some of them also use this same notation next to unlicensed games, so I dunno. Here's what I came across consistantly, besides a million GBA Pokemon fan-made hacks...
STAR WARS 3 ⊙
SUPER TETRIS DELUX ⊙
ALADDIN ⊙
TEENAGE MUTANT NINJA TURTLES II⊙
SUPER MARIO BROS 3⊙
CONTRA FORCE⊙
BATMAN RETURNS⊙
POKEMON CRYSTAL ⊙
POKEMON BLUE DIAMOND II⊙
KIRBY STAR RED DIAMOND ⊙
SUPER ALADDIN 2 ⊙
SPIDERMAN 4 ⊙
CRASH BANDICOOT 4 ⊙
FINDING NEMO 3 ⊙
LION KING 3 ⊙
POKEMON EMERALD 2 ⊙
POKEMON RUBY 3 ⊙
So there were two separate model numbers assigned for the two Aladdins, two separate model numbers for "Star Wars 3" and the real "Star Wars: Episode III". Contra Force used the same box art as the NES version, as did Batman Returns. Seems like one (or all, I don't follow the series) of those Pokemon games was a GBC game.