I just use the language trick...
I dont know why but if you change the language the game will become more stable!
Then you are able to get in the classic mode!
After "killing" the enemy the game will crash again!
But we are now just at the beginning of Gmaecube emulation so that is good so far!
Sonic Adventure 2: Battle (G4QE) - Boots with a green screen for a couple of seconds, then slowly loads Memory Card dialog.
Super Mario Strikers (GSNP) - Nothing. Window opens then quickly closes.
Ultimate Muscle: Legends vs. New Generation (GKNE) - Loading screen appears, but window quickly closes.