Ok,
Here is the patch for: "Super Street Fighter II X: Grand Master Challenge (Japan 940223)". (The patch work for Japan 940311 as well)
There is a secret input code to enable Gouki. You probably know about that already. Anyway, I changed that routine to make it little more convient to select the character.
Now you just need to push button 1 twice on the select screen. i.e you can place the cursor at any character, press button 1 to select that character, as usual. If you want
To select Gouki, press button 1 again as the plane takes off...
To make this patch you need to change 6 bytes in the rom "sfxj.03c"
Offset $e73a (9d44) = $2f2c
Offset $e962 (07d7) = $2795
Offset $e966 (b749) = $6999
*The values in the parentheses are the original values that you change.
Your file should have the CRC: A46A68FA after it's patched.
Let me know if you got any problem or have any questions about the patch.
BTW: If you want to enable "Free Play", In "system configuration". You can add this patch to the rom "sfxj.04a"
Offset $4ec0e (89bd) = $a7b5