Great Lucario guide, OS. It's a fairly even matchup, though I'd probably give ROB a slight advantage. Gyro and laser are really annoying.
Frigate- The lack of a ledge on the right side of the first transformation = easy gimps.
He can't grab the floating platform, but Lucario can cling on the wall. It's still a good counterpick, but it's just something to be aware of.
If you f-tilt, Lucario can't really punish you.
Listen to this guy, folks. Absolutely true. It's ROB's safest approach in this matchup. Lucario punishes dash attacks easily with his great OOS game, and grab just isn't a reliable approach for ROB. Ftilt puts Lucario out of range for everything but fsmash, which isn't good OOS.
Watch out for fully charged Aura Spheres though, especially when Luc's at full aura. Lucarios have many different ways of landing these, through turnaround spheres, p-sticked, or whatnot. I'm not sure if ftilt will cancel them out, but they'll deal some huge damage if they hit. Not to mention landing one offstage is often a guaranteed KO. It's very important for ROB to recover high to avoid them.
Always DI away jabs unless you're sure you'll escape otherwise. DIing towards him usually leads to an FP or a grab for Lucario, both of which are pretty devastating. I rarely see other Lucarios use jab-jab-dtilt, since dtilt won't really lead into anything. I'd hardly say dtilt is laggy, though. It's his quickest tilt, and I think it even has IASA frames.