I've played 5-6 GOOD lucarios in the past and had a hard time with all of them. Their roll is way too fast and long, and they just outrange Falco. Their aura ball is a great edgeguarder and there is no safe approach to Lucario
EDIT: Just lost again to a Lucario. Really need advice now.
Hey, I played you on AiB. = ]
Lucario is a tough matchup IMO. Mainly because I'm always so focused on Lucario's percent and special ability. So first, keep your mind off that.
Lucario is slow in the air, but has a great air game. Lasers to slow that down.
Lucario has pretty slow/predictable smashes, so keep an eye out for the finishes. Shine, shield, sh instant over b to dodge/interupt them.
Don't bother going for up air kills, you're just going to get a dair. Never get under lucario.
Most lucarios are really predictable with aura sphere. Get your reflector ready when they charge.
BACK AIR WHEN THEY ARE RECOVERING! Lucario's start up lag for that move is like hours, so drop down and bair.
It's hard to get an effective chaingrab, but down throw to dair pivot regrab works pretty well to rack up damage early.
Sorry it's a bit messy, just stuff I'm thinking about from my last lucario game. = ]
Hope this helps.