is there a way to practice edge teching especially wheres theres no one to practice with?
Go into practice, grab a remote mine, drop it on the edge, drop down, up+b into it, attempt to tech.
Alternatively, you can go into Falco's BTT test and up/over+b into the damage buffers and try teching off those.
Hey im confused on how u do the double shine? I was watching u in crew battles against PC btw great job and i saw u using the deflector but it sounded like u did it twice really fast. Do u have to jump right after the first deflector and do it again really fast?
People, Shiz really doesn't visit these boards too often, so addressing him directly won't do much good. Many of the more educated players tend to answer questions in here these days.
To answer your question: Slide your thumb from y to b really fast while still holding down. It's not really hard once you understand the concept behind it. It's good for punishing spot dodges, very useful against crouch cancelling, semi-useful against shield grabbing, and can combo fast fallers at very low percents if performed fast enough.