5 Mewtwo essentials
1. Learn basic fundamentals and get a GOOD feel for tail spacing and how to abuse the anti-air functions of his tilts. This allows you to play a proficient defense oriented Mewtwo while you're still learning the character. Also if number 4 is getting hard read by the opponent, this'll work like magic.
2. Learn how to never drop edgeguards. Your back air is your best tool by far.
3. Ledgewoop. Don't drop edgeguards. This is a part of that.
4. SH horizontal Teleport hover nair. Very non commital, free 16-20%, and you can float downwards and land during the middle of the nair for free grabs.
5. Learn each and every individual movement mixup. B-Reversals. Moonwalks. Wavedances. Teleport autocancels. Hover Cancels. Plus more.
You know
this video? I know its Melee and Fox too, and the guy is nearly frame perfect, but notice before the main combo video, notice how Dark shows off how fluid his Fox movement is. Your Mewtwo movement should be nothing less. Unpredictable, slippery, tricky, unreadable. Use what you have to the max. A true psychic type.
Optional: Learn how to abuse neutral air's IASA frames. At mid to high percents (50-70 on lights, 85-90 on midweights and 100-110 on heavies) neutral air into TP forward air/up air/back air is virtually guaranteed. All you have to do is react to the direction of the KB that the neutral air sends the opponent at. It can be tough sometimes.