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A Legendary Pokémon's Heart Slate is an item that may be dropped by Legendaries in dungeons. While players cannot recruit Legendary Pokémon (in the sense like most Pokémon are on PMU) and use them in town, when a Heart Slate is combined with a Mystery Part by Merlin, the Part can be used to summon the Heart Slate's Legendary in a dungeon, which lasts for the duration you are in the dungeon. While Mystery Parts are not droppable, Heart Slates are, and are therefore tradable.

Location and Rarity

Heart Slates are a rare drop by Legendaries in dungeons, as a boss or a Secret Room spawn. Legendaries in harder and longer dungeons typically have a higher chance of a drop. In contrast, Legendary Pokémon in easier to access locations have a lower chance of drop rate. Legendary Pokémon such as Regice that can spawn multiple times drop heart slates very rarely.


Combining Heart Slates with a Mystery Part

In the Southeastern Village in Archford, accessible after defeating Boggy Wastes, there is an Alakazam named Merlin that combines Heart Slates with a Mystery Part and resides in the Wisdom Hub on a hill on the eastern side of the Village.

Merlinhut

Merlin's Wisdom Hub is located on the hill.

The requirements needed for the fusion of a Heart Slate are:

  • A Mystery Part, found at the end of Tanren Chambers, Normal Route, at Floor 99
  • A desired Heart Slate
  • Master Rank or above (13,500+ Explorer Points)
  • 100,000 Poké, increasing with more slates


The cost of fusing a Heart Slate with a Mystery Part can be found by the formula:

$ (''n'' + 1) * 100,000 Poké $

n is equal to the number of Heart Slates already fused with your Mystery Part. For example, if you already have 3 Heart Slates combined with your Mystery Part, the formula for the cost of the fourth will be:

$ (3 + 1) * 100,000 = 400,000 Poké $


Summoning

Bring the Mystery Part into a dungeon and have an empty slot in your party. Use the Mystery Part and you will be able to select which Legendary you would like to summon out of the ones you have fused into your Mystery Part. The Legendary summoned will be the level of the highest-leveled Pokémon already on your team. Upon summoning the desired Legendary, the Mystery Part will automatically be sent back to Kangaskhan Storage. The summoned Legendary will have a random set of moves possible for it, but you can also teach it a TM move for that specific instance


Obtainable Heart Slates

The following table lists all available Legendaries with Heart Slates.

Icon Pokemon Location
144 Articuno Sky Fortress Ice Path (Boss)
145 Zapdos Sky Fortress Electric Path (Boss)
146 Moltres Sky Fortress Fire Path (Boss)
150 Mewtwo Cryptic Chasm (Boss)
151 Mew Mysterious Jungle (Boss)
243 Raikou Voltaic Rainforest (Boss)
244 Entei Sunrise Temple (Boss)
245 Suicune Iceberg Adrift (Boss)
377 Regirock Tanren Mines (Boss)
378 Regice Crystal Ruins (Floor Boss, 11F+)

Crystal Castle (Floor Boss)

379 Registeel Deserted Tomb (Boss)
382 Kyogre Seafloor Ruins East/West (Boss)
383 Groudon Inferno Volcano (Boss)
384 Rayquaza Sky Fortress Sky Garden (Boss)
385 Jirachi Starlit Lagoon (Boss)
386 Deoxys

Mt. Moon (Boss)

480 Uxie Sentimental Aquifer Depths (Boss)
481 Mesprit Sentimental Aquifer Depths (Boss)
482 Azelf Sentimental Aquifer Depths (Boss)
485 Heatran Stark Volcanic Woods (Boss)
487 Giratina Dragon's Descent Depths (Boss)
488 Cresselia Dream Grove Daydream

(F30+ Secret Room honey spawn)

491 Darkrai Dream Grove Nightmare

(F30+ Secret Room honey spawn)

492 Shaymin Easter Holiday Cave

(Secret Room honey spawn)

494 Victini Stark Volcanic Woods

(Secret Room honey spawn)

646 Kyurem Winter Holiday Cave
717 Yveltal Halloween Holiday Cave (Boss)


Trivia

  • You will be able to save millions of Poké if you get a new Mystery Part for every Legendary Heart Slate you find.