To fight your end boss instantly (usually M.Bison) in Street Fighter Alpha 3, select arcade mode. Select any character and all additional options (such as Turbo and ISMS). Immediately after, press and hold Start, Light Punch, Medium Kick and Hard Punch until M.Bison appears on the vs. screen. You must be very quick into doing this or the code might not work. Convenient for people who lost to M.Bison in regular arcade mode and can't continue.