Rotom (Japanese: ロトムRotomu) is an Electric/Ghost-type Pokémon. Rotom can transform into various forms which resembles household appliances. In some Pokémon Books it is classified as a Legendary Pokémon.
Rotom's new forms are only available in Platinum, HeartGold and SoulSilver and Black and White versions. When traded to any other versions, it automatically reverts to its original form.
Rotom changes its forms in a similar fashion to Deoxys in the Generation IV games.
Rotom is the only Pokémon with the ability to change its form by will that must possess another object in order to do so. Castform, Deoxys, Giratina and Shaymin actually transform their bodies. However, Burmy is similar to Rotom in that it merely changes its surrounding cover.
Rotom is the only Pokémon whose alternate forms have a different base stat total than that of the original form. Other Pokémon with alternate forms may have different distributions, however.
Fan Rotom is the only form with a special move whose base power isn't over 100.
Before the Generation V games, many of Rotom's Formes were the only Pokémon that could learn their special attacks, but weren't that attack's type.
As of the official Japanese tournament held in 2008, all of Rotom forms have been banned from official tournaments. This is due to the special status of the alternate forms as event-exclusive Pokémon.
Rotom's origin comes from a species of Obake, which are objects that become animate when reaching their 100th year of existence, and a Bakemono, which is referring to a state of transformation or shape-shifting.
Rotom changes type when it transforms. ( Only in Generation V+ )
In Pokémon Black and White, when it changes to Fan Rotom, it becomes a Flying type, which is immune to Ground type attacks, and yet it still has the ability Levitate, making the ability useless.
Rotom is the only Electric-type Pokémon with multiple forms.
Rotom is rumoured to be the cousin of Sinnoh's legendary trio, possibly because of these reasons: They all have the ability Levitate, they all can fly, The Trio is Legendary while Rotom is considered Semi-Legendary, and Rotom is very Smart much like Uxie, and is very brave much like Azelf.
It may be based on a Poltergeist or related to the phrase "ghost in the machine". As Banette originated from a castaway doll, Rotom may have originated from a toy robot.
Pokemon Platinum reveals Charon named Rotom. Rotom's name is actually the word "motor," spelled backwards, due to the fact that all of the household appliances she can turn into have motors. It is one of the few Pokémon that is an actual word spelled backwards.