Nice knowing you, Skitty.
If anybody played Pokemon Mystery Dungeon before, you'll know that stealing from Kecleon shop will cause the rest of the dungeon spawn a horde of almost unkillable Kecleon on Agility that's able to oneshot you. But if said Kecleon shop happens to spawn on the last floor of the dungeon, you can use Trawl Orb, collect the items and escape from the Dungeons without any repercussions.

Sadly, this has been patched on the newer Mystery Dungeon games.