NOTE: A new theory states that Pra_Mai means "Random Box" because no space for Random Box was discovered in the coding of Super Smash Bros. Brawl.
"Pra & Mai" is a package of coding found in the game files for Super Smash Bros. Brawl. It is unknown exactly what it was intended to be, however a common belief is it was meant to be the Pokémon Plusle and Minun together as a planned playable duo similar to Ice Climbers. This belief comes from the first three letters of the Japanese versions of the names (Prasle and Mainan), respectively. Plusle and Minun also appear together as a trophy, furthering this belief. However, there is no evidence that it is the pair of characters as the package is unfinished. But a big problem that knocks the Plusle and Minun Theory down is that The Ice Climbers each had their own character data (one for Popo and one for Nana) so they couldn't have possibly been a tag team, at least not in the unfinished data...Also possibly one model could have been made while the other was not so it might have been scrapped before being made resulting in an uncomplete character.