Lucas is a real annoyance to Ganon. PK Fire is the main cause of this. Projectiles are the bane of Ganondorf and PK Fire is a pretty good one. Lucas is going to need to rely on this a lot through the match to frustrate the Ganon enough into approaching, which is definitely not his strong suit. But the match can't be won alone on PK Fires.
Ganon actually happens to out range Lucas in pretty much every area. Ganon does have a little bit laggier attacks but I don't think Lucas is one known for punishing laggier attacks but rather approaches. Two of his good KO attacks are pretty much built for punishing silly approaches (U-Smash and F-Smash, d-smash as well probably but I don't know Lucas that well.) F-Smash is quick though but if it's shielded Ganon can actually punish it pretty hard, as well as a misplaced u-smash. Ganon punishes Lucas' mistakes well and out ranges him with powerful KO moves like f-air, f-tilt, f-smash, and DA. However, Lucas does really well in an important part of this match up. He can effectively shut down Ganon's thunderstorm game. Like I said, Lucas punishes approaches hard, and U-Smash and U-Tilt kill stomp. Frankly, it's really f*cking annoying.
Edgeguarding is really a 50-50 here. Ganon has a good edgeguarding game, yet has horrible recovery. If you're Lucas, you better be on top of your game with recovery. You miss a sweetspot, or start PK Thunder too close to the stage, and that could easily be your stock. Edgeguarding Ganon...I don't have much advice, his recovery sucks, that's all there is to it lol.
All in all, it seems like the match for Lucas is stopping Ganondorf from working any of his game, but its hard for Lucas to get anything going against the Dorf. PK Fire, U-Tilt, U-Smash, F-Smash, and F-Tilt are most of the key moves for shutting down Ganon. But that's the thing, once you shut him down...there's no where to go from there. You have to get your kills from shutting him down too. Lucas is frustrating. But Ganon has reach, power, priority, and some nasty punishing against a lot of your moves, so be careful.
Oh, sh*t almost forgot N-Air...yea N-Air annoys Ganon like none other.
60-40 Lucas.
(I will love the day when I can actually type 60-40 in Ganon's favor and not feel like I should change it because everybody will look at me weird.)