Cresselia, and The Heroic Hedgehog vs. Darkrai.

This fight is the first fight in the series. Between the Pokémon of light Cresselia, a Herioc Hedgehog, and the picthed-black Pokémon Darkrai.

starts
It is unknown how it starts or how it goes but it shows that Darkrai was winning. Cresselia, and the herioc hedgehog used their magic to sealed Darkrai away but ot came at a price. The herioc hedgehog died as Cresselia shattered the Crystal Of Legend into 5 pieces costing her life.

outcome
Darkrai wins.

deaths
The Heroic Hedgehog (First) Cresselia (Last)