If Miss Nani had originally still been somewhat suspicious, and had been only half-convinced by Annie, Misty, Ash, and the others' explanation, then her staff's discovery and report of the culprits who had damaged the orchard and stolen the fruit completely cleared Annie and the others of suspicion.
After all, Annie's group consisted of only a few people and Pokémon. Even if they'd eaten their fill, they couldn't possibly have plundered and wrecked the orchard on such a massive scale, much less carried off that much fruit. But if the culprit was a gigantic Snorlax, then everything made sense.
After analyzing the evidence, they determined that Snorlax—that lazy, gluttonous Pokémon who spent every day in a cycle of eating and sleeping, and ate nonstop whenever it wasn't asleep—was indeed the culprit behind the widespread theft of pomelos, also known as "buntan," and the destruction of the fruit trees on the island lately. That big guy had to eat hundreds of kilograms of food—or more—every day just to fill its belly!
Snorlax could digest anything. It had a sturdy stomach, and they said that in the Hisui region, those big eaters would suddenly appear in villages and, in the blink of an eye, clear out entire rice fields just before harvest, along with the rice stores after the harvest.
That was why Snorlax had been considered a natural disaster in many regions since ancient times, even comparable to a locust plague.
As for why such a fearsome Snorlax had suddenly appeared out of nowhere on the Seven Grapefruit Islands, nobody knew yet.
Anyway!
Once they discovered that the culprit was a Snorlax, a Pokémon on the level of a natural disaster, Miss Nani immediately mobilized the island's workers to harvest the buntan fruit.
She planned to harvest and transport all the