Pokémon

Pokémon (ポケモン) initially known in Japan as Pocket Monsters (ポケットモンスター) is a video game series by Nintendo that has spawned many manga adaptions in CoroCoro Comic and a long running TV anime series by OLM.

Bathing Scenes

Before November 1996	"Pocket Monsters/Chapter 4"
	Clefairy takes a Bath in an Awkwardly Placed Bathtub that Red provides after feeding him in hopes that Clefairy will evolve but instead Clefairy falls asleep afterwards.
June unknown date, 1997	"Pokémon Picture Book/Volume 4"
	After eating dinner, Pikachu takes a Bath before going to bed.
July 1st, 1997	"Pokémon/Episode 014"
	When arriving at the gates of Vermillion City Filthy, Kasumi Yawa mentions that she can't wait to take a Bubble Bath and ends up taking one Off Screen sometime when at the Pokémon Center.
Before August 8th, 1997	"Pocket Monsters Special/Chapter 010"
	A newspaper Red is reading mentions a story where A takes an Off Screen Bath with her Tentacool and claims that is the last bath she will ever take with it since she got shocked.
August 26th, 1997	"Pokémon/Episode 022"
	Satoshi searches an abandoned house's Ofuro and ends up seeing a woman taking a Bubble Bath in the Drop-In Bathtub. He turns away and apologizes but Pikachu points to the Mirror and notices that the lady is really a doll. Kasumi and Takeshi come into the Changing Room to tell Satoshi that they are in a dollhouse just as Natsume pulls off the roof of the dollhouse and tries the grab the group just as the run off.
October 28th, 1997	"Pokémon/Episode 031"
	Kasumi Yawa, Takeshi and Satoshi bathe in a Hot Spring wearing Swimsuits. Kasumi says that she can't understand why the Pokémon wouldn't come out of their Poké Balls. Pikachu points to one of the Diglett, who had just stuck its head out of the ground, and Satoshi, Kasumi and Takeshi stand up in their swimwear.
June 25th, 1998	"Pokémon/Episode 050"
	Meowth is seen taking a Bath with the egg that will hatch into Togepi.
Before June 27th, 1998	"Pokémon: The Electric Tale of Pikachu/Chapter 6"
	Kasumi Yawa takes a Bath in a Hot Spring with Pikachu gets peeped at by Satoshi, Takeshi and Taichi who join her while she starts running away from them.
August 13th, 1998	"Pokémon/Episode 058"
	There is an Onsen scene on Cinnabar Island where Kasumi Yawa's Togepi activates a switch that removes the border between the male and female side and Satoshi and Takeshi accidental see her Towel Bathing.
August 20th, 1998	"Pokémon/Episode 059"
	There is an Onsen scene on Cinnabar Island where Satoshi gives Pikachu a Furo session. On the other side of the Hot Spring, Musashi and Kojirou are Underwater Clothed Bathing while Meowth talks to them from on a rock.
October 5th, 1998	"Pokémon/Episode 066"
	Meowth has a Dream Sequence of taking a Bath in a Hot Spring. At the ending of the episode, he falls into a hot spring along with Musashi and Kojirou but because they are in a cold climate they feel they can't because the hot spring feels too nice.
June 24th, 1999	"Pokémon/Episode 104"
	The Mayor of Trovitopolis assures Joy that he will remove all the concrete as soon as the election is over. Later, while Mayor is taking a Bath in a Clawfoot Bathtub, an earthquake starts, then water forcefully erupts from the floor right under the Mayor's bathtub.
December 2nd, 1999	"Pokémon/Episode 126"
	Pikachu and Togepi take a Bath in Snubbull's private Bathing Pool.
Janury 6th, 2000	"Pokémon/Episode 129"
	Ash Ketchum takes a Bath. While bathing, a Blissey, offered to scrub his back. Ash agrees, but she uses a rake which cuts his back.
October 5th, 2000	"Pokémon/Episode 169"
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March 8th, 2001	"Pokémon/Episode 190"
	Musashi has Dream Sequence Bathing.
March 28th, 2002	"Pokémon/Episode 242"
	Musashi has Dream Sequence of taking a Clothed Bubble Bath in a Drop-In Bathtub made out of crystal.
November 21st, 2002	"Pokémon Ruby & Sapphire"
	There is a character named Lass Haley who says "After a battle, I always soak in the bath with my pokémon". When you reach Lavaridge Town, there is an Onsen that the character your playing as (Brendan or May) can get into clothed which two old ladies are already bathing in.
Before January 28th, 2003	"Pocket Monsters Special/Chapter 179"
	A is seen taking a Bath with her Tentacool.
December 11th, 2003	"Pokémon Advanced Generation/Episode 055"
	Musashi, Kojirou and Meowth go Towel Bathing in an Onsen together.
December 18th, 2003	"Pokémon Advanced Generation/Episode 056"
	Musashi, Kojirou and Meowth are bathing at a different Onsen and this time in Swimsuits. In a Dream Sequence Bathing scene, Sakaki is seen bathing in a Hot Spring.
July 16th, 2005	"Pokémon: Lucario and the Mystery of Mew"
	There is a Swimsuit Hot Spring scene with Masato, Haruka and Satoshi.
August 25th, 2005	"Pokémon Advanced Generation/Episode 140"
	Azumi takes a Bubble Bath in a Clawfoot Bathtub with Psyduck.
June 21st, 2007	"Pokémon Diamond & Pearl/Episode 038"
	Happiny is given a Bath by Takeshi after hatching from an egg.
January 17th, 2008	"Pokémon Diamond & Pearl/Episode 063"
	There is a Mixed Bathing Onsen scene with Swimsuits.
September 25th, 2008	"Pokémon Diamond & Pearl/Episode 094"
	Ash and his friends' Pokémon take baths and eat pancakes. This also happens to Shaymin in the movie." just like 11th movie "Giratina and the Sky Warrior"
February 26th, 2009	"Pokémon Diamond & Pearl/Episode 116"
	Froslass prepares a hot bath for the Pokémon. Piplup gets permission from Dawn to get in the hot bath. Suddenly, as Piplup splashes in the tub, he becomes frozen in a block of ice. When Froslass prepares a hot bath for Piplup, it turns out to be an icy trap and the cabin is revealed to be an illusion!
September 30th, 2010	"Pokémon Best Wishes/Episode 003"
	Iris bathes with her Axew while Ash Ketchum bathes with his Pikachu and Oshawatt.
October 12th, 2013	"Pokemon X & Y"
	There is a bathroom in the Laverre City gym which is supposed to represent a doll house. The bathroom that the gym leader Valerie has in this doll house is a western style bathroom with a Clawfoot Bathtub and a blue Shower Curtain surrounding it.
March 27, 2014	"Pokemon XY/Episode 21"
	Serena and Fennekin have an Off Screen Bath.
November 21st, 2014	"Pokemon Omega Ruby & Alpha Sapphire"
	The character named Lass Haley who says "After a battle, I always soak in the bath with my pokemon" is still present but is redesigned. When you reach Lavaridge Town, there is an Onsen that the character your playing as (Brendan or May) can get into clothed. Unlike the original, the two old ladies who were bathing were removed and the Hot Spring is split in half with a males and females side but it doesn't matter which side you go into since there is nobody bathing in either one.
March 24th, 2023	"Pokémon: To Be a Pokémon Master/Episode 11"
	Satoshi and Pikachu take a Bath in a Unit Bathtub after coming home Filthy.

Pokémon Best Wishes

Episode 104

Aired November 29th, 2012

"Fierce Fighting! Win Your Way Through the Rival Battles!" has a Sauna scene with Ash Ketchum, Stephan and Cameron.

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  source

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  Ash Ketchum and Cilan

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  Kotetsu and Stephan

Episode 110

January 24th, 2013

At the end of "A Unova League Evolution" Stephan and Ash go back into the Sauna to have a Steam Bath with Pikachu after the tournament.

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  Stephan, Ash Ketchum and Pikachu

Official Art

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  Pikachu's Rescue Adventure Concept Art