The title...does not say it all. The title is not capable of capturing the awe that this battle shall bring!
In the Red Corner, the unknown, the mysterious, the enigma, UNOOOOOWWWWNNNNN! What are its origins? Where does it come from? Where will it go? What is the type of its Hidden Power? All of these questions...and only it knows the answers!
In the Blue Corner, the embodiment of mirth, the life-giver, the spirit of Kris Kringle in raptor form, DELIBIIIIIIRRRRDDDDD! Commander of the frost and wind, Delibird is a foe to be reckoned with! Game Freak has sealed it away with its greatest weakness, Stealth Rocks, but now it is free of those constraints!
In the Green Corner, the love-fish, the swift swimmer, the rain dancer, LUUUVVVDDDIIISSSSCCCC! Embodiment of love itself, Luvdisc also commands the torrents that are as fierce, as turbulent and as mysterious as a woman's heart!
(Assume HP Psychic for Unown. Delibird and Luvdisc are not allowed to have Hidden Powers)