So, a “technique” was found that gives Shadow Mewtwo an easy win. It involves using the same projectile powered by Miracle Eye repeatedly. When the projectile hits a blocking opponent, the opponent goes into block stun. The stun lasts longer than it takes Shadow Mewtwo to fire the projectile again. You will still take guard damage from the attack, so your life will slowly drain as long as this continues.

Shadow Mewtwo also takes damage from this, but neither player’s HP will drop below 1. Since the game will give the win to the player with the highest percentage of HP left when time runs out, Shadow Mewtwo will always win because he has the lowest maximum HP.

You can see this demonstrated in the video below.

Now we wait for a patch. You can expect online to be riddled with people using this exploit before long. With word of this spreading around the internet, a patch should be issued quickly.