Big Apple

When eaten in the Pokemon Mystery Dungeon series, Big Apples will maximally fill the belly or if the belly is full already they increase the maximum belly size by 10.

Locations in Explorers of Time, Darkness & Sky
Apples appear in all shops of Waterfall Cave, Craggy Coast, Mt. Horn, Amp Plains, Treeshroud Forest, Landslide Cave, Serenity River, Lush Prarie, Tiny Meadow, Sky Peak, Mt. Travail, Marine Resort, Mystery Jungle, Oblivion Forest, Southeastern Islands, & Inferno Cave. They also appear on all floors of Brine Cave, Temporal Tower, & Surrounded Sea.
 * Drenched Bluff (always appears on 3F)
 * Mt. Bristle (always found on 5F)
 * Apple Woods (all floors & any shop)
 * Crystal Cave (shops 3F-11F)
 * Crystal Crossing (shops 3F-13F)
 * Mystifying Forest (shops 1F-4F & even floors)
 * Zero Isle East (all floors except 20F & any shop)
 * Zero Isle West (all floors & all shops except 14F, 29F, & 40F)
 * Zero Ise South (all floors except 20F & shops 1F-89F)
 * Destiny Tower (all floors except 20F & any shop)