Marshadow is a major character in the movie, <i>Pokemon: Kimi ni Kimeta!</i>. Marshadow is said to be a guide from the shadows who leads those chosen by Ho-Oh to be the Rainbow Hero. If the Rainbow Wing given to the chosen person loses its color, Marshadow is tasked with sealing the Rainbow Wing away.<br /> <br /> (Source: Bulbapedia)<br /><br />