The pokeball is usually considered a disposable item. Whether from poor aim or too independent a target, whenever a pokeball fails to capture a pokemon, it is useless for future attempts and must be discarded – unless, of course, the ball's owner has a Yamper beside them. Yamper's static electricity interfaces with a pokeball's own residual electromagnetism from its Voltorb origins (or, in synthetic pokeballs, an artificial copy of that same signal) to purify it, zapping away any traces of grass, dirt, or pokemon scents that might scare a wild pokemon away.

Industrial-scale production has made the pokeball cheaper than ever before, and transformed pokemon training from an elite pastime into a mass activity. Yet cost-conscious trainers in Galar – whether young, thrifty, or simply poor – are often advised to catch a Yamper, for owning one saves a serious trainer far more on pokeballs than it costs to feed. Yamper's love of round objects – a legacy of their origins as a Wooloo herding breed – rivals even Meowth's, and they eagerly return not only thrown balls but pokeballs and even (until the instinct is trained out of them) overly spherical teammates to their trainers.

In the age of electrification, even families who would never bother with pokemon battles often catch or adopt a Yamper, for not only are they loyal and enthusiastic companions, but they generate enough electricity to power a whole house, although this benefit is somewhat blunted by their tendency to tear up carpeting and furniture with their enthusiastic play. Once a trainer (who does not wish to use Boltund, anyway) collects a stronger team and earns enough prize money not to worry about the cost of pokeballs, it is common for them to gift their Yamper to their parents, who need no longer worry about a quiet house!