Mythical pokémon in Pokémon Brilliant Diamond & Shining Pearl are the rarest type of pokémon and are currently only obtainable through mystery gift events, often only for a limited time, or as transfers from other Pokémon games. The mythical Pokémon currently available are Mew, Jirachi, Manaphy, and Phione, with a lot of speculation around Darkrai, Shaymin, and Arceus.
To find Mew in Pokémon Brilliant Diamond & Shining Pearl, players should interact with an NPC in Floaroma Town if they already have a save file on their Nintendo Switch for Pokémon: Let's Go, Pikachu or Let's Go, Eevee. The NPC is an older woman located in the flower field to the Southwest of Floaroma Town. Once players interact with her, she will gift them a Mew at no cost and without having to catch it. Similarly, Jirachi can be obtained from the older man NPC in Floaroma Town's flower field and if players have a save file for Pokémon Sword & Shield. Like Mew, Jirachi will be gifted to the player at no cost and without successfully catching it.
The mythical Pokémon Manaphy is only available as an egg from a mystery gift in Pokémon Brilliant Diamond & Shining Pearl between November 19, 2021, and February 21, 2022. To obtain the Pokémon, players should visit Jubilife City and head to the Jubilife TV building. Once there, players should visit the second floor and speak to the TV producer to unlock the mystery gift feature. From there, players can select the mystery gift option and download the gift, which is the Manaphy egg. Then, to hatch the egg, players can walk with it in their party.
Finding Mythical Pokémon in Brilliant Diamond & Shining Pearl
The mythical =Pokémon Phione can be obtained from an egg if players breed their Manaphy with a Ditto. To breed these Pokémon, players should visit the Pokémon Nursery, located in Solaceon Town just North of Route 209, and leave their Manaphy there with a Ditto in Pokémon Brilliant Diamond & Shining Pearl. Of note, players will not be able to acquire a Ditto until they have completed the Sinnoh Pokédex, which requires players to have seen, but not necessarily catch, every Pokémon in the game. Once the Sinnoh Pokédex is completed, players should visit Professor Rowan to unlock the National Pokédex. With the National Pokédex unlocked, players will be able to catch Ditto on Route 218.
Shaymin, Arceus, and Darkrai are presently unavailable in Pokémon Brilliant Diamond & Shining Pearl, but Darkrai and Shaymin were available in the original Pokémon Diamond & Pearl. A surfing glitch will allow players to catch Shaymin early in Pokémon BDSP. Additionally, with the upcoming release of Pokémon Legends: Arceus, players may be able to trade Arceus from that game to their file in Pokémon Brilliant Diamond & Shining Pearl, just as it can be transferred from Pokémon HOME if players caught one during a previous event in another game.
Darkrai is likely to be officially available in the game through a mystery gift. Once the event is announced, players will need to have the National Pokédex and visit the house in Canalave City behind the Pokémon Center after catching Cresselia on Fullmoon Island. Once inside, an NPC will tell the player he has a reservation for them. Once they fall asleep and wake up on Fullmoon Island, players will find Darkrai in Pokémon Brilliant Diamond & Shining Pearl.
Pokémon Brilliant Diamond & Shining Pearl are available on the Nintendo Switch.