Meta Knight (SSBB)/Forward aerial
Meta Knight slashes in front of himself three times. The move has decent knockback and always does up to 10% damage if all three of the slashes hit (regardless of stale-move negation). The move is one of Meta Knight's most useful moves in tight situations, as it has extremely fast startup and ending lag, very little landing lag, great range, and transcendent priority. The move is commonly used as a SHFF when Meta Knight is either approaching or retreating from the ground, and it can be used to great effect for spacing and pressuring when combined with other moves such as down aerials and forward tilts. The move is also very useful offstage, as when used in conjunction with some of Meta Knight's other aerials, it can set up a variation of the wall of pain technique, depending on the opponent's DI and recovery options, though this is slightly limited by Meta Knight's very low air speed.
Overall, like many of Meta Knight's other moves, Meta Knight's forward aerial is a very favourable option to use in many situations, and as a result has gained a reputation of being broken.