Timbers
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Yeah, ROB shuts down your killers very well. Your bair is usually too slow to actually kill with, and puts yourself in danger if ROB attempts to use his bair or nair at the same time...as those aerials hurt a lot. His ftilt shuts down your fsmash surprisingly well.
Basically, you gotta bait ROB to kill ROB. If he's trying to approach with a nair or fair or something, stutterstep away from him and fsmash. Try to anticipate when he uses the gyro and laser, and counteract with a full aurasphere. It might be difficult to kill ROB, but just know the same thing going on in that ROB's head is how hard it is to kill Lucario. ROB's killers=nair, bair, and fsmash. The fsmash has considerable startup, and it's range is probably the same as your ftilt. Nair has a stupidly large hitbox, but it's very hard for ROB to actually land this on Lucario. ROB's bair is annoying. It doesn't really harbor enough killpower to send you to the blastzone until 140-150%, but it's still lame. Unpunishable autospacer and very low startup lag given it's properties.
Lucario needs to stay aggressive in the air. If he's trying to avoid the killers, he's going to get killed. Luc has so many options to get around ROB's air game, that I'd almost advise you to never airdodge in this matchup, unless you were returning to the stage.
Basically, you gotta bait ROB to kill ROB. If he's trying to approach with a nair or fair or something, stutterstep away from him and fsmash. Try to anticipate when he uses the gyro and laser, and counteract with a full aurasphere. It might be difficult to kill ROB, but just know the same thing going on in that ROB's head is how hard it is to kill Lucario. ROB's killers=nair, bair, and fsmash. The fsmash has considerable startup, and it's range is probably the same as your ftilt. Nair has a stupidly large hitbox, but it's very hard for ROB to actually land this on Lucario. ROB's bair is annoying. It doesn't really harbor enough killpower to send you to the blastzone until 140-150%, but it's still lame. Unpunishable autospacer and very low startup lag given it's properties.
Lucario needs to stay aggressive in the air. If he's trying to avoid the killers, he's going to get killed. Luc has so many options to get around ROB's air game, that I'd almost advise you to never airdodge in this matchup, unless you were returning to the stage.