Wavedashing and Negative Gravity
To Wavedash, build a stage with at least two squares(size 1)and two sideways platforms. Place them so they look something like this:
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Go to the two squares and just to the left of the crack, jump straght up. If you did it right, you will Wavedash. For Negative Gravity, you must build a stage that borders the area with a way down. Get to high damage(400% or more)and get smashed with a fully charged smash attack. You should get stuck in an upper corner for a few seconds.
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