That's not even an AT lol
Sonic's "AT's" aren't really very advanced. It's more like... techniques/moves done or built into special moves, but whose uses are so unique from each other.
they're cool though:
ASC cancel/multi-hit combo/KO
Spinshot
Spindash cancel (shield while side-B)
VSDJ (vertical spindash jump)
Jab lock
DAC
Homing Stall
Stutter step
Retreating F-smash/"Reverse" Stutter step
Springvincibility
Airdash
Foxtrot slide
Slow run/infinite run
B-reversal/B-reversal-cancel/B-reversal-grab
Airtrip (lol)/Footstool'd Double spring jump
Side-B invincibility frames
I don't think I have them all listed. But what's missing now is having the most appropriate usage for said techniques.
And there's still a bunch more to figure/map out, like followups to the aerials after spindash combos, grounded-spring usage/mindgames/movements (BlueTerrorist has some pretty nice usage of this ^.^), recovery tricks... etc.
Like I said elsewhere, I'm thinking of making a spring discussion thread, but right now, it seems to be too lose and complicated to explain the stuff you can do with it. ;__; It's like trying to explain the different setups you can do with PK thunder.