Electric rodents have long been known for their appetites, from Pikachu chewing on wires to Emolga denuding berry trees and zapping their fruits, but Morpeko's hunger exceeds them all. Morpeko have often been imagined as a Snorlax in miniature, a lazy, hedonistic glutton of a pokemon who does nothing but eat and sleep, but perhaps Guzzlord is a better comparison – for nothing ever quite feeds their hunger, and Morpeko, like Guzzlord, gain a dark and malicious side as they seek their next meal.

Some have imagined dark pokemon as a simple reversion to the state of nature, a species driven by that highest of all instinctual callings: survive! If so, then Morpeko, driven by instinct to steal any food around and strip berry trees bare, are the darkest pokemon of all. Yet in practice, pokemon behavior is far more complex, and dark types' malice frequently alienates those whose co-operation, or at least non-hostility, they require. Hence the sight of an approaching Morpeko is a sign for Skwovet, Pinsir, and other species who depend on the trees to defend their habitat; hungry Morpeko are often forced to make do with only the couple berries flung at their heads.

Human notions of property are no kinder to the Morpeko, but trainers are willing to pay substantial sums of compensation in return for a champion fighter. They must, however, be careful not only of their refrigerators but also their electric outlets and measure out their pokemon's food carefully, for although Morpeko do not get full or stop eating, they do still need adequate nutrition. Domestic Morpeko are kept in their balls during social gatherings, let out only if their trainer brought a sizable amount of berries; trainers must, furthermore, keep an eye out and recall their Morpeko once they finish.