[When Digivolving] If you don't have an [Arata Sanada] card in play, you may play one from your hand without paying its memory cost.
Inherited Effect
[Your Turn] All of your other Digimon with the same name as this Digimon gain <Rush>. (This Digimon can attack the turn it comes into play.)
Rulings Q&A — 1 entries
Q1Q1338
A Digimon has <Rush> thanks to this card's inherited effect. If that Digimon digivolves into a Digimon with a different name, can that Digimon attack the same turn it entered play?
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Official Ruling
No, it can't. The Digimon loses <Rush> when its name changes, so it can't attack.