yeah, sorry to break it to ya 56k, but G&W is countered by all three of them, as well as Marth, Peach, Captain Falcon, Samus, IC's, Doc, Jiggs and Ganon(and probably alot more i forgot >_>)
I highly doubt it...Then again I've been playing G&W since day one so I just adjusted to all the matchups, especially against high tiers. Maybe you're right. But I'll argue them anyway, lols.
Fox: How does he counter G&W? He can't waveshine G&W and he gets knocked too far away after the shine to even jab or Thunder's Combo him. G&W has ridiculous combos and edgeguards on Fox (as well as Falco, CF, Ganon, others). G&W is a lightweight, but only horizontally. Vertically, he's average, so there's no gaping weakness against usmash like Luigi or Puff. Fox isn't very powerful when it comes to horizontal attacks, so G&W doesn't have to worry as much there. However, if you don't switch up your recovery shinespikes aren't nice to G&W lol.
Falco: oh noes, lazers! oh noes, shine combos! Can't he do this to every character? Who cares! With G&W it's very possible to escape his shine combos, so you shouldn't be getting o-death'd. With WD you're faster than Falco, take advantage of that. Yeah this matchup is way harder than Fox though.
Marth: THIS MATCHUP IS HARD. I would consider Marth a G&W counter. Being the sick fool that I am, I like G&W vs Marth anyway.
Peach: see above.
Captain Falcon: Meh, just combo the crap out of him. Yes the knee ***** G&W, just DI and you won't die so early.
Samus: lol there's no huge advantage either way. Neither has great edgeguards on the other. Same goes for combos. G&W can use any of hit attacks to negate a missile though.
IC's: Because G&W's so light, it's nearly impossible to do the usual CGs on him. Otherwise, I lack experience in the matchup, since almost nobody in MN plays IC (thank God). G&W's attacks are disjointed like Marths, take advantage of that vs IC and try to get rid of Nana
Doc: This seems pretty neutral to me...Doc can't even dthrow G&W most of the time because he sticks to the ground.
Jiggs: not hard, You're going to be WDing around like a madman and doing a lot of fakeouts...once again take advantage of your disjointed moves and the fact that G&W's faster on the ground than Jiggs is in the air. Jiggs dies early in this matchup. Plase don't get fsmashed by Jigglypuff, even with DI you'll die at like 80% unless you're on dreamland lol
Ganon: Yes this is a hard matchup but I've figured out how to beat him.
I finally know how to beat good Ganons with G&W lol. I know because I've actually done it =P
The key to beating Ganondorf is to KEEP ****ING MOVING and avoid getting hit by fair at all costs. You're going to be DDing and WDing in and out of Ganon's range throughout the whole match. Try to bait him into using fair or any aerial really. Your fair is the money maker in this matchup, it's going to be your main combo starter and counter-attack. Once you land that fair, keep trying to hit him. Combo the crap out of him. If he lands or escapes the combo, run away. You're going to be doing a lot of hit-and-run. You can also bair him but you can't follow up and it's just an extra 10 or so damage to Ganon.
If you mess up once, you pretty much lose your stock. "Don't get hit" really is valid advice in this situation.
Once he's off the stage, it's a wrap. I suggest ftilts or fair but edgeguarding him isn't that hard, really.
EDIT: oh and light-shield when you can lol, but you shouldn't be trying to shield any of his moves, just get the hell out of his way.
EDIT EDIT: BTW G&W should not be trying to shield Ganon's moves at all , but trying to WD out of Ganon's range or something. Shielding should be a last option. If you're bold (or just cocky) and have good enough timing you can spot dodge, but it's not a good idea lol.