Lake Acuity

Lake Acuity (Japanese: エイチ Eichi Lake) is a location in the Sinnoh region, and part of the Alabaster Icelands in the Hisui region. At the center of the lake, there is a cave that is named Acuity Cavern, which is home to the Legendary Pokémon , the guardian of the lake and the Being of Knowledge.
According to Volo, the lake contains seawater, though nobody knows whether this is due to something in its geography or because of a Pokémon.
During the events of , , , Jupiter of Team Galactic captures the Legendary Pokémon living in the lake, easily defeating who had tried to defend it. After Cyrus has been defeated at Spear Pillar/ in the Distortion World, Uxie returns to the Acuity Cavern in the middle of the lake.
In , accessing Lake Acuity and its lakefront requires using , which cannot be used outside of battle before earning the from Candice at the Snowpoint Gym.
In Pokémon Legends: Arceus, the player, Volo, and Adaman or Irida come here during Mission 16: "The Trial of Lake Acuity" to obtain Uxie's Claw to forge the Red Chain.
==In the games==
===Items===
===Pokémon===
====Generation IV====
====Generation VIII====
=====Brilliant Diamond and Shining Pearl=====
=====Legends: Arceus=====
===Special encounters===
====Pokémon Diamond and Pearl====
A appears in Acuity Cavern after dealing with /. If run from, it respawns upon leaving the area.
====Pokémon Platinum====
A appears in Acuity Cavern after dealing with . If defeated or run from, it respawns after entering the Hall of Fame.
====Pokémon Brilliant Diamond and Shining Pearl====
A appears in Acuity Cavern after dealing with /. If defeated or run from, it respawns after entering the Hall of Fame.
====Pokémon Legends: Arceus====
An Alpha can be caught during Mission 16: "The Trial of Lake Acuity", which becomes available after completion of Mission 13: "Disaster Looming". Once defeated, Zoroark does not respawn. It is coded to never be .
 can be caught during Mission 21: "The Plate of the Lakes", which becomes available after completion of Mission 20: "The Researcher of Myths". If fled from or knocked out, it respawns immediately without leaving the area. It is coded to never be Shiny.
===Layout===
Version	Lake 	Cavern
 	 	
 	 	
 	 	
  	 	 
===Music===
Games	Situation 	Song name (Japanese) 	Song name (English) 	Composition 	Arrangement
 	Overworld 	みずうみ 	Lake 	Go Ichinose 	Go Ichinose
 	When under Team Galactic's control	ギンガハクタイビル 	Galactic Eterna Building 	Go Ichinose 	Go Ichinose
 	Acuity Cavern 	みずうみのくうどう 	Lake Caverns 	Junichi Masuda	Junichi Masuda
 	When battling 	戦闘！ユクシー・エムリット・アグノム 	Battle! (Azelf/Mesprit/Uxie)	Junichi Masuda	Junichi Masuda
==In the spin-off games==
===Pokémon Masters EX===
Artwork depicting Lake Acuity is seen in 's mindscape.
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==In animation==
===Pokémon the Series===
========
Lake Acuity was first featured in Pruning a Passel of Pals! when it was mentioned by and Zoey as the location where one of the is known to live.
 and were going to the Lake Acuity in Frozen on Their Tracks!, but due to Team Galactic's actions, the train was stopped at a fixed signal until the end of the episode.
The lake was the main setting of a Full Battle between Ash and Paul, which took place from Pedal to the Mettle! to Evolving Strategies!. The battle was refereed by Olivier, who was called by Reggie to preside over the match. Despite his efforts and the evolution of his into , Ash ended up losing to his rival without defeating even half of his Pokémon.
After the battle, Ash and his friends stayed at Lake Acuity's Pokémon Center so that Nurse Joy could take care of . In Uncrushing Defeat!, a silhouette of appeared at the lake and showed itself to , who was trying to find to help Ash's Monferno.
In The Needs of the Three!, it was explained that Lake Acuity, and indeed all three of Sinnoh's lakes, are the entrances to another dimension where the lake guardians reside, although they do not live in the lakes themselves. After Pokémon Hunter J detonated the Galactic Bomb at Lake Valor, Uxie emerged from Lake Acuity and ed to Lake Valor.
During the Team Galactic finale, Professor Carolina was stationed here, helping Professor Rowan with trying to keep Uxie safe.
===Pokémon Evolutions===
Lake Acuity appeared in a flashback in The Rival. and his fought against Jupiter and her at the lake, but wound up getting defeated, allowing Team Galactic to get away with .
==In the manga==
===Pokémon Adventures===
========
In Hurrah for Rapidash, parted ways with and and headed to Lake Acuity in order to protect from Team Galactic. Accompanied by Maylene and Candice, she arrived there in Stopping Sableye. Upon arriving, Platinum recalled how her father had told her that she had been to Lake Acuity before, despite her not remembering anything about it.
The three were almost immediately confronted by Jupiter, who was easily able to defeat them, despite two of them being Gym Leaders. After the Galactic Bomb was detonated at Lake Valor in Tackling Tangrowth, Uxie emerged from the Acuity Cavern and was quickly captured by Team Galactic.
===Pokémon Diamond and Pearl Adventure!===
Lake Acuity appeared in The Battle Rages On and A Novel Test!!, where Mitsumi battled and defeated Jupiter there. However, by bringing up Mitsumi's past as a Team Galactic member, Jupiter was able to throw off Mitsumi and shock , allowing her to take the latter hostage. She then contacted Cyrus, who ordered her to bring Mitsumi to the Team Galactic HQ. Mitsumi refused at first, but Cyrus was able to change her mind, and she reluctantly left with Jupiter, leaving Jun behind in the snow, where he was later found by Hareta.
==In the TCG==
Lake Acuity was introduced as a in the Pokémon Trading Card Game during the English Sword & Shield Series (the Japanese Sword & Shield Era). It was first released in the Japanese subset and the English expansion, with artwork by Oswaldo KATO. It makes all Pokémon that have any Water or Fighting Energy attached take 20 less damage from attacks from the opponent's Pokémon.
==Trivia==
* At each of Sinnoh's lakes, a TM can be found containing a powerful move of a different type. Lake Acuity's TM is the .
* Lake Acuity is the only lake in Sinnoh where the player does not fight Team Galactic. Instead, fights Jupiter, losing and vowing to become stronger.
** Accordingly, Lake Acuity is used as 's in Pokémon Masters EX.
* When Lake Acuity was first mentioned in , it was shown to be covered in snow. However, in all subsequent appearances, there was no snow present.
===Name origin===
Acuity means "sharpness of wit". This is fitting, as is the Knowledge Pokémon.
Eichi is from 叡智 eichi (wisdom, intellect), as indicated by a signpost in that provided an annotation of its name fully written in kanji as 叡智湖.
==In other languages==
Lake Acuity	
Acuity Cavern
==Related articles==
Category:Diamond and Pearl locations
Category:Platinum locations
Category:Brilliant Diamond and Shining Pearl locations
Category:Legends: Arceus locations
Acuity
de:See der Stärke (Sinnoh)
es:Lago Agudeza
fr:Lac Savoir
it:Lago Arguzia
ja:エイチこ
zh:睿智湖