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Sonic's grabgame is one of his strongest abilities as a character
Sonic can release fsmash and shield before you can release fsmash into an active hitbox
Sonic's second portion of uair outranges Luc's dair
Fsmash and dtilt are both punishable on block, Dair kills momentum and can get you punished by bairs. Don't spam it.
You're a killjoy. Looks like the jig is up.
If you actually do need help against Sonic, here's the real deal, I guess. I play Kinzer pretty often, so this should be pretty accurate.
Honestly though, if you need help with sonic you suck.
Firstly, learn to tech his Dthrow. It'll really really help in the match-up if you're having trouble against Sonic. If you can't tech it, Sonic has a VERY dangerous tool at his disposal. You should always get a free grab if you tech in place.
Secondly, learn to hit/grab him out of his spin dash. Jabs, ftilt, Dtilt, and Aura Sphere are favorites for me. If he always jumps after hitting your shield with a grounded spin dash, a Nair oos on reaction should take care of that. Once again, if you can't punish Spin Dash, you're in for a VERY annoying fight.
Thirdly, you can dair his dash attack if he hits you. Do this every time he does it until he stops.
Fourthly, always counterpick Yoshi's Isle. He has absolutely no tricks to abuse, and you can hide under the platform and stay safe. Also random platforms popping up prevents gimps.
Fifthly, Fsmash has ******** and VERY deceptive range. Learn it and don't be fooled. Also don't run into charged ones. That may sound like a bit of a no-brainer, but even very high level players fall for the occasional "Hypnosmash."
Sixthly, don't fsmash wildly. Sonic can and will grab anything you do no matter how little lag it has.
Seventhly, DI Sonic's Uthrow TOWARDS SONIC'S BACK. If you DI up, forwards, or anything else, you will fly straight up. If you use a Dair to momentum cancel, you WILL be hit by the spring uair to follow. This actually can be used to your advantage if the Sonic isn't perfect at spacing his uair to beat out your dair, as you can use your dair to kill him off the top in this case, but don't rely on this. Note that he might Fthrow instead if you start DI'ing Uthrows towards Sonic. Fthrow is very fast, and if you are DI'ing towards Sonic while he performs it, once again you will be sent straight up, prime for a Spring Uair kill.
Eighthly, don't ever think "Spring Uair? Are you serious? I'll never fall for that." If you let your guard down, you will. It happens to the best of players.
Ninthly, DI his fair into the stage as fast as you can if he fairs you offstage. Unless he starts it very early, you will be sent towards the stage instead of away.
Tenthly, be careful when landing, or he WILL grab you no matter what you do. Sonic is stupidly fast and can grab anything.
Eleventhly, fair, jabs, ftilt, and Aura sphere are your best friend. Fair will in general beat out most of Sonic's attacks other than maybe Bair. Jabs are good too. Aura Sphere is a really amazing tool against Sonic and should be used often, uncharged and charged.
Twelvthly, Fsmash if he springs too close to the stage. He doesn't autosweetspot and if you're lucky you'll catch him with it as his invincibility ends.
Thirteenthly, if you have to approach Sonic, which you shouldn't, use Fair if it wasn't obvious. It's your best option for approaching Sonic.
Fourteenthly, if he ever uses Homing Attack, punish. Homing Attack is a complete and utter abomination of a move and should be punished whenever used. I like using Aura Sphere if he does it farther away, Usmash if he's locked on, any aerial if you're in the air, or Fsmash if you spotdodge it and he lands in front of you.
Fifteenthly,remember that camping is not supposed to rack on damage itself, but as to force an approach. You can't play keep away with projectiles against Sonic. It just DOESN'T WORK. You're using projectiles to force approach, and jabs, tilts, and aerials for keep-away.
Sixteenthly, it might be good to note that at around 190, Sonic's Uthrow will kill you outright, and that his pummels are the third best in the game bar white pikmin, so you should probably not spend too much time in his grasp, though you may not be able to help it most of the time. Also it is very possible to live to 190 against Sonic if you avoid Fsmash, Bair offstage, and Dsmash.
Seventeenthly, always ban FD. He has a ridiculous amount of supersecret ways to recover on this stage, such as walljumping under the stage to Spin Dash onto the stage, and the stage is just way too flat, giving him tons of free reign to screw with you however he pleases.
Also, courtesy of Malcolm, Malcolm says that the best way to beat Sonic is to roll to the edge and fsmash. Unfortunately, I can't really say I've gotten much success with this strategy because I can't get Fsmash out at the right time to wall Sonic due to him being just plain too **** fast, but Malcolm says that's how Lee ***** him, and that he's done it before to other Sonics and that it makes the Lucario matchup impossible and very very gay.
65:35 Lucario, maybe 6:4 Luc at the very lowest. Sonic is up for a hard fight, but he can win if he tries hard enough.
Seriously though, if you need help with sonic you suck.
Also, sorry Sonic mains. Looks like I just made Lucario even worse for you guys. <<