Other known variants
x2Ghostly CriesFor each Pokémon in your opponent's discard pile, put 1 damage counter on your opponent's Pokémon in any way you like. If you placed any damage counters in this way, your opponent shuffles all Pokémon from their discard pile into their deck.
Will-O-WispIt was bound to a fissure in an odd keystone as punishment for misdeeds 500 years ago.
If you use Spiritomb's "Ghostly Cries" attack, can you put more damage counters onto a Pokemon than it would take to Knock It out?
Yes, you can. You place all the damage counters for Ghostly Cries first, then resolve any Knock Outs from the attack.
For Spiritomb's "Ghostly Cries" attack, do you put any Pokemon Knocked Out by the attack into the discard pile before or after shuffling all the Pokemon in their discard pile back into their deck?
After. Shuffle the discarded Pokemon into the deck first, then resolve any Knock Outs from the attack.