Adesign is the only Pokémon to give 6 EVs if defeated in battle.
Adesign is the only Pokémon with the Curse or Egg ??? type.
Adesign's battle theme is a mish-mash of nursery-rhyme themes, like "Twinkle Twinkle Little Star","Frère Jacques", "When The Saints Go Marchin' In" and "Mary Had A Little Lamb", interspersed with its own cry.
In the spin-off game Pokémon Ultra Fire Red XD, Adesign has a alternate form called Adesign XD. The difference is that it has the iFunny watermark at the bottom of the paper. Its canonicity is debatable however, as the events of the game take place inside of Kanye's mind.
Adesign's ability was originally Trace before its signature abilities were implemented.
Adesign is a design. (Actually, it seems to be based upon lazily designed characters.)
The shiny colorization is just the original design with inverted colors.
Adesign is a design. (Literally, it's just A Design.)