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Dark Pulse is a damage-dealing Dark-type move introduced in Generation IV.
It is:
TM79 in Generation IV and Pokémon Brilliant Diamond and Shining Pearl.
TM97 from Generation VI to Pokémon Ultra Sun and Ultra Moon.
TM20 in Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!.
TR58 in Pokémon Sword and Shield.
TM094 in Generation IX.
It is:
TM79 in Generation IV and Pokémon Brilliant Diamond and Shining Pearl.
TM97 from Generation VI to Pokémon Ultra Sun and Ultra Moon.
TM20 in Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!.
TR58 in Pokémon Sword and Shield.
TM094 in Generation IX.