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How to catch the Lake Guardians, Heatran, Cresselia, and Regigigas in Pokémon Legends: Arceus

Mesprit Uxie Azelf Heatran Cresselia Regigigas Pokemon Legends Arceus
Mesprit Uxie Azelf Heatran Cresselia Regigigas Pokemon Legends Arceus (Image credit: iMore)

There's plenty of post-game fun to look forward to once you've beaten Pokémon Legends: Arceus' main storyline and have captured both Dialga and Palkia. Upon returning to Jubilife Village, you'll unlock Mission 20: The Researcher of Myths, which puts you on the track of six Legendary and Mythical Pokémon. There's a lot to do to unlock these creatures and they're necessary if you want to go on to capture Giratina and eventually Arceus.

Turn on manual saves

Manual Save Pokemon Legends Arceus (Image credit: iMore)

If you haven't done so already, I highly recommend that you switch to manual saves before going up against these Mythicals and Legendaries in Pokémon Legends: Arceus. This makes it so the game only saves when you tell it to.

  1. Open settings.
  2. Scroll down to Autosave.
  3. Select Disabled.
  4. Manually save the game.

Make sure to manually save before each Legendary or Mythical encounter. That way, if you accidentally defeat any Pokémon instead of catching them, you can turn the game off, boot it back up, and attempt to capture them again from your last save. This is a common practice that many players have used in past Pokémon games as well.

How to unlock Mission 20: The Researcher of Myths

Cogita Pokemon Legends Arceus (Image credit: iMore)

You can only encounter these three Mythical and three Legendary Pokémon when you've unlocked Mission 20: The Researcher of Myths. The requirements to get to that point are as follows:

  1. Beat the main storyline and watch the credits roll.
  2. You'll return to Jubilife Village and Mission 20: The Researcher of Myths will queue up for you.
  3. Travel to Obsidian Fieldlands and head to the marker at the Heights Camp.
  4. Talk to Volo near the rock and you'll discuss collecting Plates.
  5. Head to the marker at Grueling Grove and you'll see Volo near the pond.
  6. Battle the Level 60 Alpha Vespiquen that appears and you'll get the Stone Plate.
    • Vespiquen (Lv 60) Weakness: Flying, Fire, Electric, Ice
  7. Return to Jubilife Village.
  8. Travel to Cogita's home at the Ancient Retreat.
  9. Take the time to listen to her explain everything she has to say. This will unlock various Mythical and Legendary encounters.
    • The three lake Pokémon - Azelf, Mesprit, Uxie, and Draco Plate
    • The Volcano - Heatran and Iron Plate
    • The crescent Moon - Cresselia and Dread Plate
    • The temple giant - Regigigas and Blank Plate
    • The beginning - Fist Plate

After listening to her explain each of the five topics, you'll have five new Missions to work on. We'll start with how to get Azelf, Mespirt, and Uxie.

How to catch Azelf, Mesprit, and Uxie Mission 21: The Plate of the Lakes

Mesprit Uxie And Azelf (Image credit: iMore)

Azelf, Mesprit, and Uxie all have the same weaknesses, so it's best if your Pokémon are at least at level 60 and you have at least one Dark, Bug, or Ghost type in your party.

  1. Travel to the Obsidian Fieldlands and head inside the cave at Lake Verity.
  2. Manually save your game.
  3. Mesprit will appear. Chuck one of your Pokémon at it to start the battle. Don't forget to use Mesprit's weaknesses against it to make this fight easier.
    • Mesprit (Lv 70) Weakness: Dark, Bug, Ghost
  4. Once you get its health down into the red chuck your best Poké Balls at it until it is caught.
  5. Head back to Jubilife Village and then travel to Crimson Mirelands.
  6. Head to Lake Valor and enter the cave.
  7. Manually save your game.
  8. Azelf will appear. Toss one of your Pokémon out to start the battle.
    • Azelf (Lv 70) Weakness: Dark, Bug, Ghost
  9. When it's health is in the red, throw your best Poké Balls to catch it.
  10. Return to Jubilife Village and then travel to Alabaster Icelands.
  11. Make your way to Lake Acuity and enter the cave.
  12. Manually save your game.
  13. Uxie is waiting to be battled inside. Throw your Pokémon at it to start the fight.
    • Uxie (Lv 70) Weakness: Dark, Bug, Ghost
  14. When it's health is low, throw your best Poké Balls until you catch it.

Once you've caught all three Lake Guardians, you'll automatically receive the Draco Plate and this Mission comes to a close. Now you can move onto the next Legendary Pokémon and it's Plate.

How to catch Heatran Mission 22: The Plate of Firespit Island

Heatran Pokemon Legends Arceus (Image credit: iMore)
  1. Travel to Cobalt Coastlands and head to Firespit Island, the same place where you calmed the noble Pokémon, Hisuian Arcanine.
  2. Enter the lair on the left where Iscan and Irida are standing.
  3. Manually save your game.
  4. You'll discover Heatran waiting for you, but you won't be able to start the battle until you throw a Ball of Mud at it and stun it. There are plenty in the cave if you need to pick any up.
  5. Throw your Pokémon out to start the battle. Use Heatran's weaknesses against it to make the fight easier.
    • Heatran (Lv 70) Weakness: Fighting, Ground, Water
  6. When its health is low, throw your best Poké Balls until you've caught it.

Once you've successfully caught it, you'll receive the Iron Plate and can move onto the next Legendary.

How to catch Cresselia Mission 23: The Plate of Moonview Arena

Cresselia Pokemon Legends Arceus (Image credit: iMore)
  1. Travel to Coronet Highlands Summit Camp and then head to the Moonview Arena, the same place you calmed noble Pokémon Electrode before.
  2. Cresselia is at level 70 and sits in the back of the arena. I suggest you manually save if you haven't done so yet.
  3. You'll find it difficult to approach Cresselia. Move slowly and push the joystick in the opposite direction that you want to go to reach this Legendary.
  4. Once you're close, throw one of your Pokémon at Cresselia to start the battle.
  5. Whittle down its health until it's in the red and then catch it with one of your best Poké Balls.
    • Cresselia Weakness: Dark, Bug, Ghost

After defeating or catching Cresselia, you will receive the Dread Plate and can move on to the last Legendary in this stretch.

How to catch Regigigas Mission 24: The Plate of Snowpoint Temple

Regigigas Pokemon Legends Arceus (Image credit: iMore)
  1. Travel to Alabaster Icelands and head to the Snowpoint Temple, where you previously traveled through to unlock Hisuian Braviary.
  2. You'll hit a closed door that requires three Plates to open it: The Icicle Plate, Stone Plate, and Iron Plate. By virtue of playing through the main storyline and capturing Heatran, you'll already have all necessary Plates to enter.
  3. Continue through the Temple until you see Regigigas.
  4. Manually save your game and then continue until you meet up with Regigigas. Throw out your Pokémon to start the battle and use it's weaknesses against it.
    • Regigigas (Lv 70) Weakness: Psychic, Flying, Fairy

You'll be rewarded with the Blank Slate once you defeat Regigigas, but this overall Mission isn't over yet.

How to get the Fist Plate Mission 25: The Plate of Prelude Beach

Commander Kamado Pokemon Legends Arceus (Image credit: iMore)
  1. Return to Jubilife Village and Commander Kamado will want to speak to you at Prelude Beach.
  2. Take a moment to change your Pokémon to your best fighters. A battle is coming up.
  3. I highly recommend you manually save your game at this point.
  4. Head to the marker at end of the dock.
  5. Now you need to battle Commander Kamado. This is going to be a tough fight, so come prepared with your best Pokémon. I highly suggest your Pokémon be at least level 65 and that you include a Fighting, Electric, Water, and Dark type.
    • Golem (Lv 65) Weakness: Ground, Water, Fighting, Steel, Grass, Ice
    • Heracross (Lv 65) Weakness: Flying, Psychic, Fire, Fairy
    • Clefable (Lv 65) Weakness: Poison, Steel
    • Snorlax (Lv 66) Weakness: Fighting
    • Hisuian Braviary (Lv 65) Weakness: Ghost, Dark, Rock, Electric, Ice

You'll receive the Fist Plate for defeating him. When that's all done, you're poised and ready to move onto the next section where you'll battle Giratina. If that feels a little too daunting, just bask in the glory of having caught your three Mythical and three Legendary Pokémon.

What a catch

With these three Mythical Pokémon and three Legendary Pokémon added to your Satchel, you're ready to go on to capture Giratina and then eventually Arceus down the road. Good luck and I hope you don't have to throw too many Poké Balls to add them all to your collection.

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Pokémon Legends: Arceus — The Researcher of Myths

Rebecca Spear
Rebecca Spear

Rebecca Spear is the dedicated gaming editor for iMore who loves playing games on Switch and iOS. She is a Zelda nut through and through and can also talk for hours about her favorite Pokémon games. She’s written hundreds of guides and reviews over the last six years to the point that if you get stuck in a game somewhere, she can help you out. On any given day, you’ll find her following the latest tech, digitally drawing with her iPad Air and Apple Pencil, reading a good book, or - you guessed it - playing video games. Follow her on Twitter @rrspear (opens in new tab) to see her post about her corgi, foster kitties, art, and favorite video game characters.