A good Lucas probably won't get gimped by a Link unless you use the pulling effect of your Boomerang. I'd say galegaurding isn't that bad of an option. Lucas' PKT2 has surprisingly good range, his Zap Jump makes him have the best second jump in the game and Magnet Pulling can put him at a good stage postion to not get gimped. I'd suggest to make him not Magnet Pull to keep Bomb's in the air and force him to either Zap Jump or PKT2. If he Zap Jumps it's hard to punish but it's risky for Lucas to do because if he messes up it's usually a lost stock unless he can PKT2 back. When he PKT2's, I'd try to tether hog him if he doesn't aim correctly, but Lucas has one of the best free fall aerial movement, so he can usually get back after that.
Ground game Link has this. Your sword can cut through our PKFire and we're forced to approach. A good zoning tactic that my friend uses is to Z-air to prevent Lucas' SH approaches and D-smash because if he isn't approaching from the air then it will outrange all his grounded approaches. There is two ways Lucas can beat this though, SHPKFire and D-tilt, however for only 6 or 8 percent, you usually will get more damage on him. Also the obvious Bomb to SHAirdodge-Z-air is always good. (note: your u-smash is easy for Lucas to DI out because he can just DI down and land underneath your last strike and he can punish if he knows the MU.
Obviously Lucas has a somewhat good aerial game, but he lacks disjoints larger than Links. Be extremely wary of his D-air because it has the best disjoint and is the second most reliable jab lock set-up in the game. At about 70, if he lands all four hit's you hit the ground hard and it's hard to tech if it's full hopped. He has three options, infinite you, d-tilt to f-smash, or the Tyr combo (all of them lead to death). Lucas obviously can't juggle Link so his U-air as a kill move is hardly used in this MU.
I'm not going to state anything about Link's recovery because I know a good Link main shouldn't be gimped too easily by a Lucas because I know that I'll be eating projectiles for Breakfast, Lunch and Dinner.
Punishment:
Grab: Lucas has probably the worst grab (debateable w/ ZSS) and it only grabs 2 frames from when a f-smash would hit. It's easily side-stepable because it only last 1 frame and he has about 60(estimate) frames or lag, PUNISH!
F-smash: Lucas has decent range on this move, but I believe that Link can shield-grab this move because of his awesome tether (better than Lucas')
D-smash: Three hit strike w/ too much start up lag, you shouldn't have much problem w/ this unless the Lucas uses your Boomerang to his advantage
U-smash: LOL (I mean literally, if he tries to pull this off, laugh out loud... it's the best form of punishment embarresment)
F-tilt: Fast, but not much range (used as a GTFO move)
U-tilt: Fast, but not much range (note: this will be used to string together with n-air)
D-tilt: Lucas has too much disadvantage for this move, you have about 6 frames to retaliate to this, so use your fastest move or just try to shield it (because I believe Link's moves are too slow)
Jab: Frame 2, it can be sheild grabbed for the first hit. Lucas only jab cancel is jab to d-tilt for 8 damage, which is not as good as his full jab combo. This move might become a pesterence to you because it's fast and hard to punish if he gets the second kick out
PKFire: Against Link, if he WB's it he's put in a bad position. Try to make sure that he's at the reach of the Z-air range to keep him from SHing it
Lucas has an extremely limited options when holding a bomb. A thing to note is that he can Zap Jump w/ an item (it makes it easier). His PKFire is his only option when holding a bomb. So when he picks up the bomb keep constant pressure on him and make it explode with him.
Anyways, I hope I helped!
