Uwotto has the highest base stat total of all non-legendary Psychic-type Pokémon.
The fact that Ayylamo and Uwotto can learn the move Steel Wing via TM is a reference to how Elgyem and Beheeyem can learn that move due to it being TM 51, since they're all based on aliens (as a reference to Area #51).
Uwotto is swearing his/her grandma.
Uwotto is based on U.F.Os as well as a xenomorph which is the creature from the movie Alien. Its black shiny coloration strengthens this connection. It also shares some minor similarities with Registeel, an actual Pokémon.
Uwotto is derived from the meme "U wot, m8?" The fact it starts and ends with respectively a U and an O may also refer to UFO.
Its name may also be derived from the character Watto from Star Wars: Episode 1.