There are 20 different wing designs that Vivillon can have on its wings. It ranges mainly in color and style based on what region that 3DS is registered/set. From each area, it differs based on the region's climate, continent and even the top most popular countries on Earth.
Vivillon has the second widest variety of obtainable Pokémon Forms, having a total of 20. It is bested by Unown, which has 28 forms.
Vivillon's name comes from "vivi", which is translated as "lively" and "papillon", which is "butterfly".