The protagonist trainer can grab up to 50 servings of food at the Battle Buffet note You're given 10 turns to grab as much as you can, meaning you can grab 10 entrees if you manage all OHKOs, and the maximum each entree can have is five servings.
Gameplay-wise, this trope is and made more practical by eschewing a National Dex.
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Lusamine and Professor Burnet both laugh this way, though Burnet comes off as endearing.
The final room in Resolution Cave is empty except for a few items, but during the post-game UB story, the final Ultra Beast is found there.
Notable in that this is the first time your trainer actually wears a swimsuit while traveling over water.