How can I get the most Memory Prisms as fast as possible from the Magitek Facility (Celes) event?

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The new Celes event has some pretty steep thresholds for rewards! The top end, a 5* Holy Orb, requires a whopping 200,000 Memories!
Since the number of memories per fight doesn't seem to be fixed, is there a way to get more of them faster?
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Fire Emblem Echoes: Shadows of Valentia - All Memory Prisms (+ DLC Memory Prisms!)
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Images: Anete Lusina, Rachel Claire, Anete Lusina, Skylar Kang