(Mostly taken from Bulbapedia )
Project VOLTAGE 18 Types/Songs is a music project and collaboration between Pokemon and popular Vocaloid character Hatsune Miku. Eighteen original songs and illustrations featuring the character were created with the theme of "What if Hatsune Miku was a(n) XX-Type Pokemon Trainer?". The project was announced on Miku's birthday, August 31st.

May also be abbreviated as PokéMiku (ポケミク).

See Also:

• Official Website
• Official Twitter