Magnezone may seem like a poor method of transportation, for they are large, heavy, and not particularly fast pokemon, although they are far quicker than humans. Yet in Sinnoh, they are the single most popular method of transportation, used by more people than either bicycles, flying pokemon, Rapidash, or cars.
The two magnetic poles of the Pokemon World are Mount Coronet in Sinnoh and Chargestone Cave in Unova, and Magnezone use their proximity to these poles to travel. It is possible to traverse all of Sinnoh in a single night on the back of a Magnezone; indeed, being able to travel from town to town in one's sleep accounts for much of their popularity. In Unova, it is somewhat more difficult, for Chargestone Cave is not centrally located and the navigation aid it offers gives out in the vicinity of Nacrene City, but they remain useful for traversing much of the region.
Magnezone are nearly perfect discs in shape, and were it not for their strong magnetism, riders would fall off instantly. Steel pokemon which battle them find themselves unwillingly attached to these pokemon, and although humans are not made of metal, they can clothe themselves in armor to make magnetism work the same way. A Magnezone rider wearing armor can never fall off their pokemon, but must order their Magnezone to eject them, and even children can ride these fused, electromagnetic creatures with ease.
The Magnet Train which connects Kanto and Johto replicates the concept behind Sinnoh's Magnezone transportation, but must rely on artificial magnets instead of a magnetic pole and is therefore restricted to a single route. Magnezone can traverse this railroad as easily as trains do, and are often used by maintenance workers to travel quickly along the track when the Magnet Train is out of service.