It all started with a legend passed down from the People of the Water... 
Somewhere in this world, there is a temple created by the People of the Water. The Sea Temple contains a hidden treasure, the Sea Crown, but no one has ever seen it because the temple is protected by a secret mechanism. So it drifts through the vast ocean undetected, waiting... waiting... 
Ash and Pikachu learn about the legend and meet Jackie, a Pok&eacute;mon Ranger on a mission to protect a Manaphy egg and find the temple. The Phantom, a nefarious pirate, plans to obtain the Sea Crown and take over the world--but first he needs the Manaphy egg. What is the Sea Crown? How does Manaphy's mysterious power connect it to the Sea Temple? Can Ash help Jackie complete his mission?
 
(Source: Viz Media)

Satoshi and his friends get lost in an unknown wasteland. They eventually come across a "Water Pokemon Show" performed by the star of the Mariner Troupe, Hiromi. Hiromi is a descendant of the troupe of Water People able to communicate with water pokemon, and she tells our heroes the legend that's been passed down by her people for generations. According to legend, a temple the Water People built called "The Water Temple Akuusha" rests somewhere in the ocean, and a treasure called "The Water Crown" is hidden there. It's said that no one has ever seen this treasure, but that changes when a Pokemon Ranger named Jack Walker (aka Jackie) appears to chase aftert it. 
Jackie is on a top secret mission that has him protecting the egg of the leader of the water pokemon, Manaphy. This pokemon, called the "Prince of the Sea," needs to be taken to the Water Temple Akuusha, so Satoshi-tachi and Hiromi decide to help him. Along the way, a pirate named Phantom attacks our heroes from his great submarine. Phantom plans to use the Water Crown's power to help him conquer the world, but he'll have to solve the mystery of Manaphy's egg first. When the Rocket-Dan get into the mix, Jackie uses his Capture Styler to borrow the power of a nearby pokemon to stand up to them. Satoshi and Pikachu enter the fray, but they still have to contend with the attacks of Phantom's powerful high tech mecha! Suddenly, the egg starts to shine with a vivid light, and Manpahy is born! 
What is the mystery of the legendary treasure? What mysterious powers does Manaphy have? Can Satoshi-tachi and Jackie complete their top secret mission? The journey to reach the Water Temple Akuusha has begun!

Mezase Pokémon Master celebrates the final chapter in Satoshi and Pikachu's story, with their first companions and many Pokémon they have met throughout their journeys making their return.

Pocket Monster Omega Ruby Alpha Sapphire: Akaki Jounetsu to Aoki Eichi are two Pokémon manga created by Hatha Shingo.
The Crimson Passion and Indigo Wisdom stories run parallel to each other and star twin brothers named Omega and Alpha. Each brother sets out to capture Groudon and Kyogre, respectively. The two stories were collected together in one volume.

Special animation made to commemorate Pokemon Day 2025. 

This short follows the story of Hana, a young girl who lives in Paldea and admires the Dragonite postman. She aspires to become a postman but one day finds a letter with no addressee so decides to try and help find the send with her partner Fuecoco. When they find the sender, a boy named Rio, they learn that Rio sent the letter to celebrate the birthday his father who lives in Kanto, and to make it worse, the birthday is today. It's up to Hana, Rio and Dragonite to get the letter to him as soon as they can. 

(Source: Serebii, edited)