I've compiled a quick list of games that I know are working in the latest build.
Animal Crossing - Works
Crash Bandicoot: Wrath of Cortex - Works
Final Fantasy: Crystal Chronicles - With more GBAs level loads will take longer and longer. Seems playable otherwise. Sometimes characters jitter.
The Legend of Zelda: Four Swords Adventures - Works
The Legend of Zelda: Four Swords Adventures+ - Works; Tetra's Trackers has broken audio on VBAs side.
Mario Golf: Toadstool Tour - Connects and transfers everything. VBA runs at 70% while connected.
MegaMan X Command Mission - Works, requires LLE for audio to work properly on VBAs side due to ucode switching.
Metroid Prime - Works
Nintendo Puzzle Collection - Works
Pacman VS - Works
Pokemon Series - Requires throttle off to connect. Subject to problems during connection. one GBA works well, but further GBAs get successively difficult.
Sonic Adventure - Works
Sonic Adventure 2 - Apparently disconnects early popping up an error, but works anyway for dropping off and picking up. Stats carry over.
Star Wars Rogue Squadron 3 - This works. I don't think any existing hardware will get full speed, but it works.
Wario World - Works
Animal Crossing - Works
Crash Bandicoot: Wrath of Cortex - Works
Final Fantasy: Crystal Chronicles - With more GBAs level loads will take longer and longer. Seems playable otherwise. Sometimes characters jitter.
The Legend of Zelda: Four Swords Adventures - Works
The Legend of Zelda: Four Swords Adventures+ - Works; Tetra's Trackers has broken audio on VBAs side.
Mario Golf: Toadstool Tour - Connects and transfers everything. VBA runs at 70% while connected.
MegaMan X Command Mission - Works, requires LLE for audio to work properly on VBAs side due to ucode switching.
Metroid Prime - Works
Nintendo Puzzle Collection - Works
Pacman VS - Works
Pokemon Series - Requires throttle off to connect. Subject to problems during connection. one GBA works well, but further GBAs get successively difficult.
Sonic Adventure - Works
Sonic Adventure 2 - Apparently disconnects early popping up an error, but works anyway for dropping off and picking up. Stats carry over.
Star Wars Rogue Squadron 3 - This works. I don't think any existing hardware will get full speed, but it works.
Wario World - Works
