As a lucario main, it is very difficult to know when to use your kill confirms because of the aura scaling so I made a list on the percent lucario will get his kills/kill confirms.
Main notes: All of these were tested on Ike. Lucario's base aura is at 70%. At zero percent his multiplier is 0.66. At 140% the multiplier is 1.32. At Max aura (190%) the multiplier is 1.7
Lucario percent ranges for kill confirms:
When lucario is at 0%:
Uthrow>upair150%
Fair>bair(at ledge)105%
Fair>up air150%
Uptilt(ending)>upair145%
ASJCUS>upsmash165%
Forcepalm grab(from ledge):145%
When lucario is at 70%:
Uthrow>upair100%
Fair>bair(at ledge)74%
Fair>up air 110%
Uptilt(ending)>upair110%
ASJCUS>upsmash115%
Forcepalm grab (from ledge);95%
When lucario is at 140%:
Uthrow>upair 60%
Fair>bair(at ledge)54%
Uthrow>upair>up air23%
Fair>up air 65%
Uptilt(ending)>upair70%
ASJCUS>upsmash65%
Forcepalm grab (from ledge):60%
When lucario is at 190%:
Uthrow>upair 40%
Fair>bair(at ledge)40%
Uthrow>upair>up air10%
Fair>up air 60%
Uptilt(ending)>upair50%
ASJCUS>upsmash50%
Forcepalm grab (from ledge):45%
Main notes: All of these were tested on Ike. Lucario's base aura is at 70%. At zero percent his multiplier is 0.66. At 140% the multiplier is 1.32. At Max aura (190%) the multiplier is 1.7
Lucario percent ranges for kill confirms:
When lucario is at 0%:
Uthrow>upair150%
Fair>bair(at ledge)105%
Fair>up air150%
Uptilt(ending)>upair145%
ASJCUS>upsmash165%
Forcepalm grab(from ledge):145%
When lucario is at 70%:
Uthrow>upair100%
Fair>bair(at ledge)74%
Fair>up air 110%
Uptilt(ending)>upair110%
ASJCUS>upsmash115%
Forcepalm grab (from ledge);95%
When lucario is at 140%:
Uthrow>upair 60%
Fair>bair(at ledge)54%
Uthrow>upair>up air23%
Fair>up air 65%
Uptilt(ending)>upair70%
ASJCUS>upsmash65%
Forcepalm grab (from ledge):60%
When lucario is at 190%:
Uthrow>upair 40%
Fair>bair(at ledge)40%
Uthrow>upair>up air10%
Fair>up air 60%
Uptilt(ending)>upair50%
ASJCUS>upsmash50%
Forcepalm grab (from ledge):45%