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How do you get the secret weapon at armed Armadillo's stage
Toast the final boss with this trick. Here's the breakdown. To perform the trick, you must have all eight boss weapons, all nine heart tanks, and all four sub tanks.
When you begin the game, don't go to the Sigma Stage. Instead, enter the Armored Armadillo stage.
Play to the end of the stage four times, keeping your Energy and Weapon meters at maximum. It's okay if you take a hit or use a weapon during the stage just be sure to recharge both meters by the time you get to the end of the stage.
Each time you reach the end of the stage, you must use the Escape Velocity to restart at the beginning of the stage. Remember, you must play though four times and always have full Weapon and Energy at the end of the stage.
After the fourth play-through, escape and restart one more time for a fifth try. This time, however, don't use the Escape Velocity. Instead, ride the third wheeled platform across the canyon and climb up the cliff before the entrance to Armored Armadillo's lair. On the top of the cliff, you will find a power-up capsule containing Dr. Light in a Ryu costume. He will give you the "Hadoken" Fireball technique!