I've been playing Smash 4 quite a bit lately, and have seen online that some players are able to use Marth/Lucina's Shieldbreaker to propel them a substantial distance horizontally while in the air. Checking smashboards and the wiki confirms that Shieldbreaker was buffed to have a small amount of horizontal propulsion. My own experimentation that simply using shieldbreaker in the air produces a small amount of horizontal propulsion, however nowhere near the levels I've seen online. Does anyone know how to do this? I tried inputting a direction after starting shieldbreaker, much like Dedede's gordos require, but it didn't seem to do anything.
How to achieve large horizontal aerial propulsion with Marth/Lucina’s Shieldbreaker
super-smash-bros-4
Related Solutions
Each of the individual gunmen has their own independent damage and firing speed. It is not possible to alter when they shoot, or control which one appears.
The specific gunman that appears is random, but with limitations - all five must appear before one can appear twice. Or in other words, they're like a deck of cards - draw one of the five without replacement every time you use the move, and shuffle them again after the fifth time.
The only indication is that trail effect of attacks is brighter at the tip of Marth's sword, comparision between Brawl (top) and SSB4 (Bottom) below:
Based on that, you can get a better idea of where your attacks connect with the opponent. A general rule of thumb is to always play as far away as possible. A nice way to test this is actually in melee, where Roy was strongest when you connected with the broad of his sword, and Marth was with the tip. It actually led to some very different playstyles.
Reference to attack trail being brighter is here.
Marth's attack trails are much brighter at the tip, making the sweetspot of his attacks more visible than in previous games.
Best Answer
Marth/Lucina's shieldbreaker can be held down for longer to create a stronger hit (as demonstrated here). When the shieldbreaker is tapped in midair, you'll receive a small amount of horizontal propulsion. However, if you hold down neutral B in midair and charge the shieldbreaker fully, Marth will gain a large amount of horizontal propulsion. You don't need any other button inputs to get the boost.
Note that once you reach a full shieldbreaker charge, Marth/Lucina will automatically complete the attack (which is where you get the large boost). If you try to let go too soon in midair, you'll only get the small amount of propulsion. Also note that Marth/Lucina cannot jump high enough to perform this boost by the time they reach the ground on a level stage like Final Destination (You'll hit the ground before the charging is complete, so you'll throw a ground shieldbreaker instead).