So, although not entirely confirmed, according to Yamask's dex entry, Yamasks were humans, and the same thing problably happens with other ghost-types.
Duskull. Duskull is a Pokemon that does anything for children's cry.
What if, after Lucille died, she turned into a Duskull, and made the second Power Plant (the one we go into) explode
OR, if you say that ghosts can't make contact, what if a Nuclear Pokemon can see ghosts, or just Lucille-Duskull, and exploded the thing for her? A Ranger does mentions about Nuclear 'Mon's soulless, blank eyes.