Doc. vs. Ganon is possible for Doc. Spacing, grab combos, bairs, capes. Spacing more so than anything. Once you're grabbed at like 100% it's dthrow to either fair or bair dependent on your DI. You need to DI this match. If you're bad at recovery it makes the match go from 50 - 50 to 70 - 30 in Ganon's favor. His uair is just too broken and will eat anything you've got for the most part, dominating your pills. Your only chance is recovering from above. Sometimes you might want to mix up your recovery as well. For instance, try DI, PTP, reverse DJ pill, space bairs to the stage instead (while recovering from above) then up+B or air-dodge based on the situation.
Tilts also help a lot. If you're afraid you will miss the cape, ftilt instead. If you think he's gonna grab you while you're next to him, utilt ... it's fast and the hitbox is good. The match is based off spacing (including pill-spacing) and correct timing on grabs. Momentum is nice too but that's primarily only during a combo where the finish is a perfectly placed punish of some sort. Whether it's something like uair juggle combo to predicting him trying to DJ out of the upcoming fair, so full jumping the fair opposed to the final SH fair ... or something like that.
It's as simple as this. If the Ganon player is smarter than you, you're probably screwed. If you at least know the match-up well and know what you're supposed to do, the match is nearly equal. It's only ever in your favor once you've found out the Ganon player's mind-set, and how to punish them for it. For some players, it takes several games until they find that out, if they ever do. For others, it's only a few stocks, if that. That's what separates pros from amateurs, though.