If you're running PC, I have a Lucifer fusion loop that you can use to help quickly get that Persona to 99 all stats, and you can stem off of that loop for whatever other Personas you wish to have:

Lucifer's Morning Star is the only Persona exclusive that you'll need anyway (Unless you're running Merciless, in which case you'll need Alice's Die For Me!)

Written document below for the loop too that you can do:

https://docs.google.com/document/d/14fZGLgvLM_A5GAQTy8n5vfVTujNdgM7nDlbUakiJMJE/edit?usp=sharing