A list of Key Items in Yo-kai Watch 4
Permanent Items[]
| Name | Image | Found | Use | Description | Obtained from |
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| Yo-kai Watch | 
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Automatically given at the start of the game | Allows you to see, summon and befriend Yo-kai. | 妖怪が見えるようになる 不思議な腕時計。
妖怪たちとの 思い出と絆がつまっている。 |
Chapter 1 |
| Yo-kai Watch Arcane (Summer's) | 
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Allows you to see, summon and befriend Shadowside Yo-kai. | エルダ魔導鏡とも呼ばれる 純白の腕時計。
2つの姿の妖怪を 召喚することができる。 |
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| Yo-kai Watch Arcane (Nate's) |
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Allows you to see, summon and befriend Yo-kai. | |||
| Yo-kai Watch Arcane (Katie's) |
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Allows you to see, summon and befriend Yo-kai. | |||
| Yo-kai Watch Elder Zero | 
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Allows you to see, summon and befriend Yo-kai. | |||
| Yo-kai Watch Ogre | 
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Allows you to see, summon and befriend Yo-kai as well as summon Yo-kai to possess to user. | オーガ封珠鏡とも呼ばれる 漆黒の腕時計。
4体の幻魔と 剣武魔神を憑依召喚できる。 |
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| Yo-kai Watch Animas | 
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Allows you to see, summon and befriend Yo-kai as well as summon Celestials. | |||
| Youma Radar | 
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妖気を探知できる 不思議なレーダー。
困った時は 積極的に使っていこう！ |
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| Suzaku Soutenzan | 
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Allows Suzaku to possess Cole | |||
| Genbu Hotenfu | 
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Allows Genbu to possess Cole | |||
| Tiger's Talon | 
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Allows Byakko to possess Cole | |||
| Wildfire Blaze | 
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Allows Asura to possess Cole | |||
| Stormweaver |   
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Allows Lord Acala to possess Cole | 手のひらサイズになった フドウ雷鳴剣。
剣武魔神・不動明王の力が 宿っている。 |
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| Kirin Celestial Disk | 
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Allows Bruno to summon Kirin | |||
| Suzaku Celestial Disk | 
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Allows Bruno to summon Suzaku in his Celestial form | |||
| Genbu Celestial Disk | 
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Allows Bruno to summon Genbu in his Celestial form | |||
| Byakko Celestial Disk | 
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Allows Bruno to summon Byakko in his Celestial form | |||
| Souryuu Celestial Disk | 
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Allows Bruno to summon Souryuu | |||
| World Ark (Future) | 
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Allows the user to travel to the future | 世界のトビラを開くための 不思議なカギ。
開いた先は 未来の世界に繋がっている。 |
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| World Ark (Present) |
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Allows the user to travel to the present | |||
| World Ark (Past) |
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Allows the user to travel to the past | |||
| Yo-kai World Ark (Past) |
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Allows the user to travel to the Yo-kai World in the past | |||
| Yo-kai World Ark (Future) |
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Allows the user to travel to the Yo-kai World in the future | |||
| Yo-kai World Ark - Soukenzan | 
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Allows the user to travel to Soukenzan | |||
| Yo-kai World Ark - Houkenden | 
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Allows the user to travel to Houkenden | |||
| Yo-kai World Ark - Mystic Grove | 
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Allows the user to travel to Mystic Grove | |||
| Sumo Ring Ark | 
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Allows the user to travel to the Sumo Ring | |||
| Itsuki's home key | 
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Allows the user to enter Takashiro Manor | |||
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Allows Nate to ride a bike | ||||
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Allows Katie to ride a bike | ||||
| Fashionable Bicycle | 
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Allows Summer to ride a bike | 何となく おしゃれな雰囲気のする自転車。
ゆっくりこげば 爽やかな風を感じられる。 |
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| Chic Bicycle | 
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Allows Cole to ride a bike | 落ちついた雰囲気のする シックな自転車。
こぐと きっちりマイペースに走っていく。 |
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Allows Bruno to ride a bike | ||||
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Allows Jack to ride a bike | ||||
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| Blizzard Wolf Card | 
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| Pocket Mirapo | 
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Allows the player to warp to Mirapo at any time (outside dungeons) | |||
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| Genbu GUN | 
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| Physical Equipment Book lv. 1 (Japanese: 闘技武器大全・上巻 Tōgi buki taizen jōkan) | 
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接近戦用の武器の作り方が書いてある本。
初歩的な武器について 書かれている。 |
Quest 003 reward | ||
| Physical Equipment Book lv. 2 |
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| Physical Equipment Book lv. 3 |
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| Spirit Equipment Book lv. 1 (Japanese: 妖魔武器大全・上巻 Yōma buki taizen jōkan) | 
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遠距離戦用の武器の作り方が書いてある本。
初歩的な武器について 書かれている。 |
Quest 001 reward | ||
| Spirit Equipment Book lv. 2 |
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Mystery 5 reward | |||
| Spirit Equipment Book lv. 3 |
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Quest 039 reward | |||
| Defensive Equipment Book lv. 1 (Japanese: 守護防具大全・上巻 Shugo bōgu taizen jōkan) | 
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身を守る防具の作り方が書かれている本。
初歩的な防具について 書かれている。 |
Quest 002 reward | ||
| Defensive Equipment Book lv. 2 |
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| Defensive Equipment Book lv. 3 |
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Mystery 13 reward | |||
| Magic Defense Book lv. 1 (Japanese: 妖魔防具大全・上巻 Yōma bōgu taizen jōkan) | 
|
特殊な防具の作り方が書かれている本。
初歩的な防具について 書かれている。 |
Quest 004 reward | ||
| Magic Defense Book lv. 2 |
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| Magic Defense Book lv. 3 |
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Mystery 14 reward | |||
| Omamori Equipment Book | 
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Quest 040 reward | |||
| Gokiri Equipment Book | 
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| Tsukumono Equipment Book | 
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| Onnen Equipment Book | 
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Quest 011 reward | |||
| Mononoke Equipment Book | 
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| Uwanosora Equipment Book | 
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| Oni Equipment Book | 
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Quest 041 reward | |||
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| Goldenyan Tag | 
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| Damona Tag | 
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| Komashura Tag | 
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| Shadow Venoct Tag | 
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Quest 044 reward | |||
| Sighborg Y Tag | 
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| Jinpei's Earcuff | 
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| McKraken Tag | 
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| Kage Orochi (Shadowside) Tag | 
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| Slimamander Keystone | 
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| Jingeki Keystone |
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| Shinmagunshin Fukurou Keystone |
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| Lady Arachnia Keystone |
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| Shien Keystone |
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| Soranaki Keystone |
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Temporary Items[]
| Name | Image | Found | Use | Description |
|---|---|---|---|---|