I fought Facciolo twice because I wanted the picture and missed it the first time- so I've got a good strategy down.
To the right of the final checkpoint is a 1-up monitor that comes back after death, effectively giving you infinite lives...
Which you are very much going to need.
Aether is your best bet in Phase 1
by far- Arcane Rush and Speedwave are good for getting the necessary height and then spamming Sword Rain to get in damage.
She's also the more sensible attacker in phase 2, but if you're gonna rely on her be ready to swap a
lot, because you're
going to get hit (
and separated from your rings)
a LOT.
Contrary to popular belief, Inazuma
can solo the Moonreaper- move towards him in arcs when he's using blade beams and when charged attacks are about to end. Once he's vulnerable, you should be able to get 3-4 hits in before he teleports.
Speed types with thok type moves will also benefit from this strategy in multiplayer.
Optimized, Inazuma does
more damage than Aether, and even if not he can still end the fight in a
somewhat reasonable amount of time.
It's also more
fun to use him to fight- it feels like an actual Sonic boss.
Once the escape begins, wait for Ina's idle, and then hold spin to transform and enjoy the fireworks.
Holding spin also charges the mega blast.
Good luck and have fun, because I sure did!