Hypnosis, Dream Eater, Nightmare, Dark Pulse is a solid moveset for a Darkrai focused on:
* Offensive pressure: Hypnosis sets up for Dream Eater and Nightmare, which are both powerful STAB moves that hit hard in the sleep state. Dark Pulse is a powerful secondary STAB move for those that resist or break out of sleep.
* Stallbreaking: This moveset can help Darkrai break through stall teams by putting key threats to sleep and eliminating them quickly.
However, consider these other options:
* Focus Blast: For coverage against Steel, Dark, and Fairy types. This can be a good option if you're facing a team with a lot of those types.
* Nasty Plot: For extra power. Boosting your Special Attack with Nasty Plot makes your moves even more powerful.
* Thunder: For coverage against Water and Electric types.
Ultimately, the best moveset for your Darkrai depends on the team you're building and the metagame you're playing in.
Here are some questions to consider:
* What other Pokémon are on your team?
* What types of Pokémon are you most likely to face?
* What strategy are you aiming for with your team?
By considering these factors, you can choose the best moveset for your Darkrai to help you win battles.