Need help with reverse dolphin slash.

[Joe_Sumo]

When I try to finish people with reverse dolphin slash the trajectory seems off. Instead of nearly perfectly horizontal like in the videos, they go up at about a 50 degree angle. Im fairly certain i got the sweet spot because they still go flying but they dont quite die.

Yes i have used search plz no flaming...

 

[Massive]

You need to use the diagonal Dolphin slash for horizontal distance.
Marth's Up-B is exactly like Roy's in terms of the control stick altering its trajectory, its just not as pronounced. When you Dolphin slash, you need to have a diagonal influence on your attack, you'll be able to tell if you did it right by noting how high and far horizontally you go (its a wee bit trickier on the reverse, but the principal is exactly the same, you need to hit the angle before you turn around).

 

[FrostByte]

1) You're not hitting with the sweetspot which is just in front of Marth. You are too close.

2) Your opponent knows how to DI.