This trick can be done with any of X's armors except the Shadow Armor. Go to the controller configuration screen and turn on the 'Auto-Fire' feature. Play the game normally. Whenever you want to make slashing combos, make sure you are not directly next to a wall and have a comfortable position for [Dash]. Hold [Slash] as soon as the saber touches the ground, but before it starts to get small, press [Dash]. This will cancel the slash and start a new one. You can use this technique to perform slash combos similar to Zero's from Megaman X4 and Megaman X5.