Are stat boosting items permanent if used in Joyous Tower?

Question

I have a few Sitrus berries and zincs and stuff and I want to use them, but not of they’ll only last while in the dungeon. Are the joy seeds also temporary

Comments

I don't think you're able to bring items into the tower in the first place.
https://bulbapedia.bulbagarden.net/wiki/Joyous_Tower#Generation_VIII

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You can pick them up and use them in the dungeon, or keep them afterwards iirc