1 official ruling from Bandai. Straight answers to how this card actually resolves.

If I digivolve [BT5-056]/[Rafflesimon] on top of another [BT5-056]/[Rafflesimon]. Can I use the <Once> effect of the new Rafflesimon if the old Rafflesimon used it before?
Yes, you can.
Got a line that uses Rafflesimon? Map it in the builder and share it with a link.
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