*EDIT* I solved the problem, see below *EDIT*
I've been playing the NTSC-J version of Metroid Fusion with VBA v 1.8.0-beta3, and I was trying to get a complete gallery (all ending images). According to pretty much every online source (such as this one: http://metroid.retropixel.net/games/...d4/endings.php) there are supposed to be 10 ending images (on that list 1 and 7 are the same), 5 for normal mode and 5 for hard. I got all the normal endings, and the hard mode ending for under 2 hours 100%, but whenever I meet the requirement for one of the other hard mode endings, it gives me the normal mode ending instead. I originally was playing with the rom from the main emuparadise site, but I tried several others to no avail.
To summarize, I'm playing Metroid Fusion (J) for GBA, and I can only get 6 out of the 10 endings, with the other 4 sending me to the wrong ending. If anyone else plays it and can see if they get the right endings for Hard mode <2 hours <100%, >2 hours 100%, 2-4 hours <100%, or >4 hours <100%, or if they know what's wrong, that would help a lot.