What can you do as a free member?

Member benefits illustration

Create your free account today and unlock all our premium features and tools to enhance your gaming experience.

Member benefits illustration

Create your free account today and save articles to your watchlist and get notified when they're updated with new information.

Member benefits illustration

Create your free account today and save your favorite games for quick access later, synced across all your devices.

Member benefits illustration

By creating a Game8 account and logging in, you'll receive instant notifications when someone replies to your posts.

Comment rating feature illustration

By creating a Game8 account and logging in, you can make use of convenient features in the comments section, such as rating and sorting comments.

Premium archive feature illustration

By creating a Game8 account and logging in, you can access Premium articles that are exclusively available to members.

Site Interface

Guest
Free Member
Article Watchlist
Game Bookmarks
Cross-device Sync
Light/Dark Theme Toggle
User Profiles
Direct Feedback
Comment Rating

Game Tools

Guest
Free Member
Interactive Map Access
Interactive Map Pins
Interactive Map Comments
Interactive Map Pins Cross-Device
Check List
Event Choice Checker
Deck Builder Cross-Device
Message Board Notification
Message Board Cross-Device
Build Planner
Stat Calculator
Diagnostic Tool
Weapon/Armor Wishlist

Want more information?Learn more

Pokemon Legends: Arceus

The Diamond Clan's Treasure Guide and Walkthrough (Request 89)

3
Add to Watchlist

✬ Pokemon HOME Dex Completion Shiny Rewards:
┗ Meloetta | Manaphy | Enamorus | Keldeo | Meltan
☆ Check out all PLA Pokemon Transferrable to BDSP!
★ Finish the story → Story Walkthrough
┣ Complete the Dex → Pokemon Locations / Trading Board
┗ Research Tasks → Best Tasks / Farm Research Points

Find out how to get the Adamant Crystal in The Diamond Clan's Treasure Request to transform Dialga into its Origin Form in Pokemon Legends: Arceus. Read on for a walkthrough of the Request, including rewards, location, how to complete it, and the Pokemon you need!

◀ Previous Request Next Request ▶
Steely Lucario The Pearl Clan's Treasure

List of Contents

How to Unlock The Diamond Clan's Treasure

Unlock Location

Adaman Location
The Diamond ClanEnlarge
Beside Lake Valor
Request Location in Map
The Diamond ClanEnlarge
Crimson Mirelands

Unlock Condition

After completing the main story of Pokemon Legends: Arceus, you can unlock this request by talking to Adaman beside Lake Valor in Crimson Mirelands.

Post Game Content and 100 Percent Guide

The Diamond Clan's Treasure Information

#89 The Diamond Clan's Treasure
The Diamond ClanEnlarge
Requested By Adaman
Description Adaman of the Diamond Clan has challegened you to a battle. Claim victory against him to find out more about the treasure he mentioned.
Recommended Rank 8

The Diamond Clan's Treasure Rewards

Reward Qty
Adamant Crystal Image Adamant Crystal
 x1
Comet Shard Image Comet Shard
 x3

The Diamond Clan's Treasure Walkthrough

Mission Objectives

Steps to proceed through The Diamond Clan's Treasure
1 Head to Crimson Mirelands and and talk to Adaman at Lake Valor
2 Battle and defeat Adaman to complete the request.

Battle against Adaman

Battle Against Adaman

During the battle against Adaman, he will send out a Vaporeon, Leafeon, and Umbreon all at the same time. It is best to start off by defeating Vaporeon and Umbreon due to their lower level before taking on Leafeon.

Pokemon with super effective moves against all three Pokemon and are not weak to their types are recommended for this battle. Hisuian Decidueye, Lucario, and Togekiss are a few great Pokemon to bring along to this fight.

Adaman's Pokemon
Vaporeon ImageVaporeon
Lv. 32		 Leafeon ImageLeafeon
Lv. 64		 Umbreon ImageUmbreon
Lv. 32

Dialga Origin Form is Unlocked

PLA Dialga Origin Adamant Crystal

After defeating Adaman during the battle, you will receive the Adamant Crystal, which you can use to transform Dialga into its Origin Form. You can always transform Dialga back into its regular form by using the Adamant Crystal again.

How to Catch Dialga - Origin Form and Learnset

The Diamond Clan's Treasure Pokemon

Pokemon Required for the Quest

There are no Pokemon required for this quest.

Previous and Next Guides

◀ Previous Request Next Request ▶
Steely Lucario The Pearl Clan's Treasure

Pokemon Legends: Arceus Related Guides

Request Walkthroughs Banner.png

All Request Walkthroughs and How to Unlock

List of All Requests

No. Mission No. Mission
1 Wurmple Can Evolve 2 Adorable Starly
3 What Did Shinx's Ears Look Like? 4 Big Buizel, Little Buizel
5 What It Takes to Be Awesome 6 Mushroom Cake Marketing
7 Playing With Drifloon 8 Bothersome Bidoof
9 Zubat's Eyes 10 Wurmple's Evolved
11 The Timbre of the Fields 12 A Perfect Pickling Stone
13 Trees that Bear Berries 14 Berry Helpful
15 Balloon Race in the Fieldlands 16 Strange Happenings at Midnight
17 To Bloom or Not to Bloom 18 Please! Make Me a Pokeshi Doll!
19 A Peculiar Ponyta 20 The Mysterious Will-o'-the-Wisp
21 Back-Alley Mr. Mime 22 Eerie Apparitions in the Night
23 Getting Ahold of New Wares 24 Inspiration from Hippopotas
25 The Pokemon in the Woodland Photo 26 Aim for the Big Leagues
27 Help Wanted: Plowing the Fields 28 Measuring Your Compatibility
29 The Search for Bitter Leaves 30 A Beautiful Rose...
31 Setting Up the Bogbound Camp 32 The Headache-Stricken Psyduck
33 What a Massive Mushroom! 34 Croagunk's Curative Poison
35 Battling with Pachirisu 36 Watering with Care
37 The Fragrance of Nostalgic Herbs 38 Gone Astray...in the Mirelands
39 All about Magikarp 40 The Charm Lost in the Swamp
41 An Elegant Tail 42 Help Wanted: Watering the Fields
43 More New Wares 44 The Pokemon in the Nighttime Photo
45 Shellos of the East and West 46 Setting Up the Coastlands Camp
47 Balloon Race in the Coastlands 48 The Taste of Home
49 Keep an Eye Out for Aipom! 50 Double the Tails, Double the Fun
51 Coming Up Roses 52 Eevee's Evolutions
53 Octillery's Ink 54 Serving Up Swap Snacks
55 Poor, Peckish Piplup 56 Getting Help from Machoke
57 The Taste of Honey 58 Gone Astray...in the Coastlands
59 Misdreavus the Hairstyle Muse 60 Help Wanted: Rock Smashing in the Fields
61 Even More New Wares 62 The Pokemon in the River Photo
63 Fancy, Fashionable Wormadam 64 Getting to Know the Ghosts
65 Setting Up the Mountain Camp 66 The Sea's Legend
67 The Clefairy's Moonlit Dance 68 A Nosepass to Guide the Way
69 Gone Astray...in the Highlands 70 Colorful New Looks
71 New Wares Yet Again 72 Pesselle's Easy Errand
73 Which is the Real Burmy? 74 A Bit of Help from Blissey
75 Kirlia the Hairstyle Muse 76 Mushroom Hunting with Swinub
77 Gone Astray...in the Fieldlands 78 Setting Up the Icepeak Camp
79 Balloon Race in the Icelands 80 The Perfect Pickle Recipe
81 In Search of a Fiery Pokemon 82 Traces of a Lost Village
83 Snow-White Vulpix in the Snow 84 The Bergmite Enthusiast
85 At Home under the Eaves 86 Gone Astray...in the Icelands
87 Rolling with Spheal 88 Steely Lucario
89 The Diamond Clan's Treasure 90 The Pearl Clan's Treasure
91 On the Trail of Giratina 92 A Token of Gratitude
93 The Darksome Nightmare 94 Incarnate Forces of Hisui
95 A New Anomaly 96 Massive Mass Outbreak in the Fieldlands
97 Massive Mass Outbreak in the Mirelands 98 Massive Mass Outbreak in the Coastlands
99 Tricky Treat Strategy 100 Massive Mass Outbreak in the Highlands
101 Massive Mass Outbreak in the Icelands 102 Daybreak
103 Digging for Tomorrow 104 Battling the Security Corps' Secret Weapon
105 The Ultimate Balloon Race 106 Adaman's Hope
107 Irida's Wish 108 Bidoof's Path of Solitude
109 Eevee's Path of Solitude 110 Wormadam's Path of Solitude
111 Abra's Path of Solitude 112 Blissey's Path of Solitude
113 Sneasel's Path of Solitude 114 Rotom's Path of Solitude
115 Bastiodon's Path of Solitude 116 Roselia's Path of Solitude
117 Magikarp's Path of Solitude 118 Roserade's Path of Solitude
119 Kleavor's Path of Solitude 120 Lilligant's Path of Solitude
121 Wurmple's Path of Solitude 122 Kricketot's Path of Solitude

Comment

See more comments (3 Comments)

Author

Pokemon Legends: Arceus Walkthrough Team
This article was created by Game8's elite team of writers and gamers.
    Leave feedback(Login required)
    Please participate in our site
    improvement survey
    12/2025
    Would you assist in
    improving Game8's site?
    ×
    This survey will take about 1 minute.
    Your answers will help us to improve our website.
    We are listening to our users' valuable opinions and discussing how to act on them.
    The information collected through this survey will be used for the purpose of improving our services. In addition, the information will only be disclosed a part of a statistic in a format that will not allow identification of personal information.
    Begin Survey
    Not Now
    ×
    Please rate each item regarding Game8.co's Advertisements.
    Amount of Ads
    Very Dissatisfied
    Somewhat Dissatisfied
    Fine
    Somewhat Satisfied
    Highly Satisfied
    Placement of Ads
    Timing of Ad Display
    Ad Loading Speed
    Safeness of Ads
    Content of Ads
    ×
    Please rate each item regarding Game8.co's Quality of Articles.
    Amount of information
    Very Dissatisfied
    Somewhat Dissatisfied
    Fine
    Somewhat Satisfied
    Highly Satisfied
    Frequency of updates
    Speed of new information
    Accuracy of articles
    Understandibility of articles
    Readability of sentences
    ×
    Please rate each item regarding Game8.co's Usability of the Site.
    Ease of finding information
    Very Dissatisfied
    Somewhat Dissatisfied
    Fine
    Somewhat Satisfied
    Highly Satisfied
    Loading Speed
    Use of Color
    Font Size
    Visibility of Images
    Easy to Understand Layout
    ×
    Please rate each item regarding Game8.co's Message Boards, Comments.
    Ease of Writing
    Very Dissatisfied
    Somewhat Dissatisfied
    Fine
    Somewhat Satisfied
    Highly Satisfied
    Readability
    Ease in Finding Information
    Comment Quality
    Comment Quantity
    Admin Response
    ×
    Please rate each item regarding Game8.co's Site's new design.
    Please rate our site's new design
    Very Dissatisfied
    Somewhat Dissatisfied
    Fine
    Somewhat Satisfied
    Highly Satisfied
    Do you think that the website's design change makes the site easier to use?
    Has the new design made it easier for you to find information on the site?
    Has the new design improved the overall visual appeal of the site?
    How would you rate your overall satisfaction with the new design of the site?
    ×
    How likely are you to recommend Game8 to someone you know?
    Very Unlikely
    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    Very Likely
    If you have other opinions regarding potential improvement to the website, please share them with us. We would appreciate your honest opinion.
    Note: This is a free response section, so you can proceed without entering anything.
    Note: Please be sure not to enter any kind of personal information into your response.
    ×
    Thank You
    ×
    Thank you for participating in our survey! Your answers will help us to improve the quality of our website and services.
    We hope you continue to make use of Game8.
    Close
    For other opinions or comments, go here.

    Rankings

    Popular Articles
    Message Board
    • We could not find the message board you were looking for.

    Gaming News

    Best PS5 RPGs (December 2025)

    Best PS5 RPGs (December 2025)

    Popular Games

    Recommended Games

    All rights reserved

    ©2021 Pokémon. TM, ®Nintendo.

    The copyrights of videos of games used in our content and other intellectual property rights belong to the provider of the game.
    The contents we provide on this site were created personally by members of the Game8 editorial department.
    We refuse the right to reuse or repost content taken without our permission such as data or images to other sites.

    Pokemon Legends: Arceus Walkthrough & Guides Wiki

    Quick Access
    Guide Index

    Message Boards

    Pokedex

    New Pokemon

    Hisuian Forms

    Returning Pokemon

    Pokemon by Category

    Pokemon by Generation

    Story Walkthrough

    Trainer Battle Guides

    Other Story Walkthrough Guides

    Requests

    Base Game Requests

    Daybreak Requests

    All Wisp Locations

    Bosses

    Maps and Locations

    Alpha Pokemon

    Obsidian Fieldlands

    Crimson Mirelands

    Cobalt Coastlands

    Coronet Highlands

    Alabaster Icelands

    Items

    Evolutionary Items

    Poke Balls

    Berries

    Crafting Materials

    Healing Items

    Food Items

    Throwables

    Charms

    Training Items

    Battle Items

    Valuable Items

    Mints

    Balms

    Key Items

    Beginner's Tips & Guides

    Mechanics

    Tips & Guides

    Moves

    News and Game Info

    News

    Trailers

    Game Features

    Updates and Patch Notes

    Characters

    Clans and Organizations

    Galaxy Expedition Team

    Diamond Clan

    Pearl Clan

    Ginkgo Guild

    Ancient Retreat Resident

    Jubilife Village Residents

    Tier List

    S - Tier

    A - Tier

    B - Tier

    C - Tier

    Japanese Pokemon Legends: Arceus Walkthrough

    Other Pokemon Wikis