Using Lucario's aura bomb (hold neutral b) while landing in a specific timing disables the strong hitbox and the aura sphere looks like staying in the same spot. Has been like this since multiple patches (currently beta 0.49.6)
https://github.com/user-attachments/assets/2631207d-dffc-423d-ba36-62ba7712b1c0
https://github.com/user-attachments/assets/9e4089f5-0b75-474e-aef4-a0699b29ff2e