Alright Ulti your ganon is pretty good, but here are some pointers/tidbits that you might be able to use.
Against Doc: I personally think this match up is 50/50, Ganon can easily neutralize pills with just his F-airs, b-airs and his tilts, so try to neutralize his pills and it'll force them to come to you. Also, retreating b-airs destroy Docs and Marios. Additionally, try to use reverse up-airs when you're pretty sure Doc has to up-b, also when they do their down-b to gain more vert, simply run out there and up-air or F-air, and it'll completely kill there jump. Spacing yourself out is important in this match up, but isn't dire; it just presents more opportunities to exploit.
Against Marth: Now this match-up I'm still learning myself, so I can't really help you a whole lot like Tipman and Linguini can, but I can tell you as much as I know. Ok, so NEVER roll into Marth. They'll most likely up-tilt or F-smash and heavens knows you don't want that, it'll make too vulnerable and Marth can combo Ganon so easily it's not even funny. If you see them doing f-air spamming; up-airs will usually knock them out of that, if you see them doing neutral-a, then spaced b-airs are your best solution.
If you find yourself off the stage and you know they're going to space themselves off the ledge and F-smash, save your up-b and come up from below the ledge, and depending on your percent you can wall-jump tech and up-b or b-air (simply wall tech jump and slam the c-stick back for the b-air to come out) Edgeguarding Marth is tricky but it can be done. Whenever you see him using his side-b to approach then run of and f-air. Also use the Marth killer if you don't know how, press Z and move the control stick of the direction you're facing while holding Z and back. If you can anticipate a F-smash and you're really close, ALWAYS grab or up-b out of shield. If you happen to grab, then make sure you up-throw or d-throw, and I think at like...30% a down-throw can lead to a d-smash, which can lead into other things, also use the wizard's foot and side B sparingly, they're easily punishable moves if they become to unpredictable.
So next time no more vids of your Ganon losing. I want to see a win! (preferably a 3-4 stock) =)