• Mega Upper
  
• Slide
  
• Shoot lemons
  

• N-air (insta-shield, for you S3&K fans out there) has incredible effective priority and near-instant startup, making it great for escaping and even turning around u-tilt combos, juggles, etc.
  
• N-air is also really good to use to rack up %s when coming out of a spindash jump, because it's a way more reliable hit than any of Sonic's other aerials. Basically, out of the "roll" portion of a Spin Dash or Spin Charge, just hit A once to jump into your opponent, carrying them upwards, and then mash A until they get hit with the instashield.
  
• Switching between Side-B and Down-B can confuse your opponents, since the little hop caused by the side-b can throw off their timing.
  
• Don't be afraid to just RUN AROUND! Going from a full-tilt dash into a momentum-sliding shield-grab is an effective mix-up strat that, following an upthrow, has tremendous combo/juggling potential; meanwhile, downthrows rack up % damage, and backthrows and (to a lesser extent) frontthrows can kill at high %s.
  
• Plus, Sonic's running-start Upsmash has always been a beast (though he suffered from the removal of DACUSing in 1.04/WiiU), and his dash attack's no joke, especially with it's new "kick".
  
• While Sonic's Downsmash is now less visually distinct, and its hitboxes no longer linger as a result, its reduced startup time and front-and-back coverage make it a better move overall than its Brawl counterpart.
  
• Sonic's Fsmash has a deceptively long reach, especially when properly angled, and deceptively mighty kill power.
  
• If your opponent is in the air, they are your PREY. That doesn't mean "chase them past the top camera borders and hope for a lucky hit", however. Unless you're ABSOLUTELY CERTAIN that you can chain two or three up-airs into a topkill, just fastfall/d-air back to earth and wait for your target to come to you.
  
• Of course, if you CAN confidently land an up-air at high percents and/or close to the top blast line, then DO IT TO IT. It's cool as hell and difficult for your opponent to punish if you miss. (...Unless your opponent has "plunging" moves like Stone, Yoshi's Ground Pound, Toon Link's dair, etc. Don't try to juggle them vertically.)
  
• Don't even bother trying to land the meteor hitbox of the d-air, it's a fool's errand and you'll probably selff-destruct. Sonic rewards swag and style, to be sure, but there's no swag in making yourself look like a suicidal moron.
  
• B-air is loving amazing, as it was in Brawl, with deceptive range and incredible kill potential, especially when chasing offsides. Just don't let it get Stale Moves'd to death, and make sure you're facing the right way to land it.
  
• F-air has kill power offsides, too, but its REAL capacity for murder isn't through sheer launch power, but through its ability to gimp recovery while allowing Sonic to get back safely to stage. If your opponent is recovering low, just run right off the stage and f-air them away, retreat to the ledge to refresh your jumps, and repeat. If they're recovering high, use your jump power to intercept and pressure them back into the void.
  
• Alternately, on compatable stages you can easily b-air low-recovering, high-ish % opponents back into the stage geometry, often resulting in a Stage Spike straight into the pits of hell, or at least a considerable bounce-back recovery gimp.
  
• Homing Attack isn't the GREATEST, of course, but once you learn its range it can be a good mix-up strat for recovery, or a fun and effective way of getting around projectile spammers like the Links.
  
• Lastly, as I believe Maple Leaf mentioned, many of Sonic's moves defy "counters" like Shulk's Vision, Little Mac's Slip Counter, etc, because THEY'RE TOO SLO-OOW. Don't get cocky, but know that even with perfect reflexes, NO Little Mac or Ike player can actually hurt you by countering your Spin Dash Rolls.
  

DoctorWhat fucked around with this message at 16:43 on Dec 2, 2014

• SKID-CANCELLING
  
  There's a way to pop out F-smashes really quick and cool-like. It's tricky to learn at first, but basically, whenever you let go of the left stick in order to stop running, Sonic will slide for a bit and enter a "skidding" animation. This means that, for a short while after "telling" Sonic to stop running, you're STILL stuck in a "running" state, meaning that (other than u-smashes, specials, grabs, and aerials) the only thing you can do is a dash attack. Bummer, right?
  
  Well, here's the neat bit: partway through the "skidding" animation, there's a VERY LOUD "skidding" sound effect. The INSTANT that SFX starts playing, you can interrupt the skidding animation with ANY ground action - shielding, jabbing, any tilt, or ANY SMASH ATTACK in EITHER direction. THIS is how you use Sonic's F-smash to murder people.
  
  HOWEVER, there IS a catch. Sonic actually has TWO "running" states, depending on how long you've been in the dash for. The above advice only applies to the "long" running state. You can tell which "state" you were in based on Sonic's stopping animation. If he slides with both feet planted on the ground, you haven't been running long enough, and the recovery time is actually LONGER, and there's no audio cue. BUMMER!
  
  
  
• THE SPINSHOT
  
  Okay, this is the Good poo poo, now. Sonic has an advanced recovery technique called the "Spinshot". The Spinshot allows for varied approach options, improved/varied horizontal recovery, and mindgames. And best of all, performing the Spinshot (on Wii U) requires basically ZERO effort, timing, or special dexterity.
  
  There are two varients to the Spinshot: grounded, and aerial. The GROUNDED Spinshot is also known as the Instant Spin Dash Jump (ISDJ) or the Thok. The AERIAL Spinshot... is just called "the Spinshot". While they have some slightly different properties, they're both executed the exact same way:
  
  Start charging Sonic's Down-B (the "Spin Charge"). This does NOT work with his Side-B ("Spin Dash"). Once Sonic's revved up ANY amount, let go of down and B, point the left stick towards [the the direction you were facing when you started the Charge], and slam the C-stick in ANY direction.
  
  When performed on the ground, Sonic will instantly perform an EXTREMELY long jump at regular-jump height (it's as long as Battlefield!), during most of which he has a persistant hitbox akin to jumping out of a rolling Spin Dash/Spin Charge. You can perform any aerial, including Nairs, out of this "slingshot" jump. Its trajectory is COMPLETELY fixed, until interrupted by an aerial.
  
  The aerial spinshot is almost identical, but with two major caveats: ONE, aerial Spinshots lack the passive hitbox of the "Thok". TWO: More importantly, you can ONLY perform the spinshot if you STILL HAVE YOUR DOUBLE-JUMP IN RESERVE. (Performing the spinshot will consume your double-jump, but since it's an objective improvement over the usual double-jump in terms of recovery, I'd wager that's fair.)