If falcon DIs the uthrow.. could you techchase?
Sounds horribly unreasonable but idk.
At 0, you can't combo anything besides utilt. He's heavy, and the animation of throwing him up takes too long. By the time your throw lag subsides, it will be too late for usmash and he'll already be teching. Falcon's tech is really, really slow...so if he d.i.s at below 10, just start moving and re-grab him. At about 20 you can start usmashing with no d.i.
Just remember to not go for a nair if he d.i.s away at super low percents, or you'll miss an easy techchase grab. Everyone makes this mistake, thinking they can catch him with it or something.
Okay my old question coming up again because I looked at the topic, and it didn't answer one part of my questions.
So how do you continually waveshine on people with less traction? I saw a video of Zhu flying across a little over 1/4 of FD, I'd say, in a split second. Wavedash doesn't get you that far with Fox even if you can do it perfectly.

Tips/tricks/solutions/answers?
Also, when does u-throw > u-air work? Listing any (besides the aforementioned 95%+ for Sheik on the last page, IIRC) characters and percentages would be helpful since I could just look up the weight classes.
I already made a list for this, so I'll post it again for you to read.
Most characters can't be continuously waveshined. It all depends on their traction. If they slide too far from the shine, then you'd have to SH aerial/grab/usmash to continue comboing them.
Characters that can't be waveshined repeatedly (shine->shine->shine) should immediately be usmashed or grabbed after you successfully land a shine. Once you've perfected those B&B techniques, you can start mixing it up with waveshine-> nair/dair/dsmash/utilt etc.
Characters you can waveshine repeatedly:
Bowser
Falcon
DK
Ganon
Link
Peach
Sheik/Zelda
Yoshi
Samus
Characters that can't be waveshined repeatedly:
(JC shine-able characters are listed below)
(Just because they can't be waveshined over and over again, DOES NOT mean a grab or usmash will not combo. Marth/Mario/Doc/Ness for example, can be waveshine comboed into usmash and grab. Some characters, due to their terrible traction, can't be comboed at all after a shine.)
*can only be comboed by an illusion after a JCed shine or in a corner.
Luigi
Ice Climbers
*can be comboed with most moves after waveshine, excluding another shine. (JC shines can work on these characters)
Mario
Doc
Marth
Ness
Keep in mind that the angles of certain levels will kill follow-ups. Corneria and DK64 are good examples. Sometimes when you shine they will be knocked into the air or bounce because of the sloped ground. When an opponent has been shined into the air or while in the air, their landing animation cancels out the shine's stun or "pushback frames". They can then do anything freely from that neutral position (i.e. Roll, shield, attack, jump)
Characters that fall down from the shine:
(if you land a shine on these characters, I suggest you go for a thunders combo (waveshine -> jab), or techchase grab, usmash, or any other move you think will work.)
Falco
Fox
Game and Watch
Jiggs
Kirby
Mewtwo
Pikachu
Pichu
Roy
Young Link
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Posting all the percentages for every character regarding uthrow uair would be really tedious. General uthrow uair rule is that if it is known to combo on them, it is safe to do in upwards of 30%, and slightly lower with certain characters.
Do you mean dash-cancel? Also, does that mean that anyone with traction greater than or equal to Marth's is waveshineable?
Jump cancel and dash-cancel are two different thinks. Jump cancelling involves you running -> jumping -> cancelling the jump with a move (i.e: JC grab). Dash cancelling is simply holding down while you are running, which cancels your run. This is not to be confused with crouch cancelling, which is related to cancelling hitstun after taking a hit.
Marth/Mario/Doc/Ness can be JC shined continuously., but its hard to do and not worth it. To JC shine, start running, jump, perform a shine. The key is cancelling the jump fast enough to stay on the ground with shine. Repeat this until you have achieved your desired result.
Go into a full run with any character, then hold down. By crouching, you have cancelled your dash. voila
Is the inputs for wavedashin backwards slower than wavedashing forward
It can be, but it shouldn't. The reason people do it slower, is because they don't want to accidentally turn around. Also, the inputs for both waveshines are slightly different. You have to angle the control AFTER you jump for the backwards waveshine, otherwise you'll sit in shine and turn around.