Anyway here is one poopy matchup from expeirience: Samus ):
-Is too floaty and can break out many of Lucario's moves easily (Cant even connect the third hit in your jab combo
-Can counter Lucario's AS (aura sphere) with neutral special
-Spacing is especially hard because of range on grab, which can also counter a force palm at mid low %s
-friggen spammed missiles counter Double Team!
-has a meteor smash and a suit that prevents aura leakage
Reported for double posting
Yooooo lol wut.
EDIT:Idk if this was known, found something cool with Lucario's jab. So if you use consecutive jab 1's standing in place whatever, (Quick testing you are able to repeat jab 1 when any part of Lucario's left hand passes head) the aura "wave" will visibly enlarge that will do more damage and can be "saved" while using other jabs right at or near the ending frames. Noticebly on jab 2 after "aura charging" on jab 1, a sphere of aura will enlarge on his left hand fairly sized. This is very much better seen on 3ds, which is probably why you missed it.
I dont know if this works with other moves or if it also inceases priority, reduces lag of next attack, etc. You will actually need the 3ds version since the Wii U graphics are too HD to notice some difference worth caring about.
This seems on the surface useless but might not be. This may turn out really big if someone can devote time to it. It may be a new mechanic in the game or just a bug, I have a theory that somehow moves staleness can be reversed by activating it right at the ending frames of the same move previously used.
This seems not worth mentioning just wanted to see if I was crazy