Pikachu is the signature Pokémon of the Pocket Monsters anime, and the first Pokémon that Satoshi obtained on his journey as a Pokémon Trainer, given to him by Professor Okido.

(Source: Bulbapedia) 

A young boy named Satoshi embarks on a journey to become a "Pokémon Master" with his first Pokémon, Pikachu. Joining him on his travels are Takeshi, a girl-obsessed Rock Pokemon Trainer, and Kasumi, a tomboyish Water Pokémon Trainer who may have a crush on him. Satoshi and Co. end up traveling through various regions, including Kanto, the Orange Islands, and Johto, and then enter the Pokémon League competitions there. Along the way, they run into many confrontations with Musashi, Kojirou, and Nyarth, a trio of Pokémon thieves who are apart of an evil organization called "Team Rocket". But everytime Team Rocket try to do their evil deeds, they fail thanks to Satoshi and his Pokémon. 
(Source: Anime News Network)

__Hobbies:__ Japanese dancing, jazz (vocal), and modern ballet

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The journey of Satoshi and his friends through the Kalos region continues! After Satoshi obtains his seventh gym badge, the group is moving toward the next town when Eureka discovers a mysterious Pokémon resting in her pochette. Soon given the name Puni-chan, it is one that even Satoshi and Serena's new Pokémon Zukan cannot identify. However, it quickly becomes apparent that Puni-chan is the target of a mysterious group clad in bright red suits known as Team Flare, aiming to capture the new Pokémon to further their agenda. But when Satoshi and the gang realize that the enigmatic organization has no intention of treating Puni-chan with any decency, they take a stand in opposition to Team Flare's plans, daring to fight back.
 
With Gojika's predictions looming above them, Satoshi aims for his final gym badge while Serena contests for her last Princess Key in order to be able to compete at the TriPokalon Master Class. But as Team Flare begins to move in search of the mysterious Z, the stories of Pokemon XY and Pokemon XY: Mega Evolution cross paths as Satoshi and his friends, along with Team Rocket, get caught up in a scheme that could put Kalos in great danger.
 
(Source: MAL Rewrite)

Red is just a normal kid living in the rural Pallet Town, when he decides to go out on his own adventure, along with his rival since childhood, Green. In this world of Pokemon, he makes many friends, humans and Pokemon alike. However, all is not well. Team Rocket is trying to capture Mew, a very rare Pokemon, and is performing experiments on other Pokemon, trying to increase their power. Red and his friends must battle against Team Rocket to stop their cruel experiments and unlock the secrets of Pokemon.

Pokémon Trainer Satoshi has a new plan: see the world! But first, he and his partner Pikachu are headed to the opening of the Sakuragi Institute, a research facility dedicated to uncovering the mysteries of Pokémon in every region. Satoshi meets Gou, another boy with boundless curiosity about Pokémon, and both are overjoyed when Professor Sakuragi asks them to become official research fellows. With Satoshi as determined as ever to become a Pokémon Master, and Gou aiming to catch one of every Pokémon (including the Mythical Mew), our heroes are in for adventure and excitement as they explore the wide world of Pokémon!
 
(Source: Pokémon TV)
 
Note: Episode 119, 121, 126 and 128 are recap episodes that did not air outside of Japan.

Satoshi and Pikachu have arrived in Lumiose City of the illustrious Kalos region to capture more Pokémon and continue their journey toward becoming the very best. Meanwhile, a genius inventor named Citron and his little sister Eureka wander the city when they run into Satoshi who quickly challenges them to a battle. However, they are soon caught up in a dangerous incident when Team Rocket, following Satoshi into Kalos, cause a Gaburias to rampage through the city.
 
Far away in the quiet Vaniville Town, a young girl named Serena slogs through daily Sihorn riding practice at the behest of her mother, a professional Sihorn racer. After practice, she sees the events unfolding in Miare City on television where she recognizes a boy from her childhood. Having left a significant impact on her life, the sight of him stirs in her a desire to meet him again; and so, Serena sets off to Miare City, determined to find the boy from her past.
 
Pokemon XY follows the group as they travel throughout Kalos in pursuit of their ambitions—Satoshi challenging Pokémon gyms, Citron learning from Satoshi, and Serena searching for what exactly her dream is. Along the way, they meet new friends, face new rivals, and continue to thwart Team Rocket's schemes, all the while discovering a little about the mysteries of mega evolution.
 
(Source: MAL Rewrite)

After his mom wins a free vacation trip, Satoshi and Pikachu are off on another adventure. This time in the tropical land of Alola. There they meet new friends, Pokémon and explore new islands. 
 We also get introduced to Z-Rings, a device used for Z-Moves. What kind of mysterious Pokémon and challenges will come their way, and why is Kapu-Kokeko so interested in our young trainer?!

A team of scientists use the DNA of a rare Pokemon, Mew, to create the world's strongest Pokemon, Mewtwo. Not wanting to be used as an experiment, Mewtwo uses its psychic powers in a violent rage to destroy the scientists who created it. Mewtwo then tries to learn how to focus his powers with the aid of Giovanni, the man who funded the scientists' operations, but discovers that it is being used again. So Mewtwo decides to find its own purpose in life, and carry out its revenge on humans by destroying life on earth by using a deadly storm. Ash Ketchum and a group of other Pokemon Trainers are summoned by Mewtwo to have a battle with it, but they soon discover that they're only being invited so Mewtwo can clone their Pokemon for it's own purposes. Ash then tries to find a way to stop Mewtwo's plot before it can be carried out. 
(Source: Anime News Network)

After defeating Brandon and declining the offer to be a Frontier Brain, Ash sets off to travel through the far away land of Sinnoh. Once he gets there, he meets up with Hikari, a local trainer from the region, and they decide to travel together.

After participating in the Johto League, Ash decides to begin anew in yet another journey; this time by himself and Pikachu, in the land of Hoenn. Though he isn't alone for long, as 10-year-old May (whom dislikes Pokemon, but just wants to come along to see the world) travels with him after Pikachu destroys her bicycle. Ash also meets up with his old companion, Brock, and May's younger brother, Max. Together, they travel along in Hoenn, battling Gym Leaders, entering Contests, and other events on the way to the Hoenn League. 
(Source: Anime News Network)

A greedy collector, Lawrence III, wants to capture the legendary Pokémon, Lugia. But in order to do so, he must capture the Titans of Fire, Ice, and Lightning. The titans are powerful bird-like Pokémon, and if they are disturbed they will wage a war against eachother which will ultimately result in earth's destruction. Ash, Misty, and Tracey get caught up in the situation when they end up being washed ashore onto Shamouti Island. Soon after, Ash meets a girl named Melody who sends him into a mission where he must collect the 3 Orbs which will quell the fighting, but first Ash must gain help from the Beast of the Sea, Lugia, if he's to succeed. 
(Source: Anime News Network)

A Special Music Video in tribute to the Pokémon Series of Games, set to the song Acacia by Bump of Chicken.

While touring Alamos Town-home of the Space-Time Tower- with the beautiful Alice, Ash and his friends discover that the town's special garden has been decimated! Baron Alberto, a dashing but arrogant fellow, immediately blames the destruction on Darkrai. 
As if it just overheard the accusation, Darkrai appears and confronts our heroes! 
Who is Darkrai? Is is a fiend... or a friend in disguise? And as a battle between Legendary Pokemon Dialga and Palkia rages directly abouve Alamos Town-and threatens to tear a hole in the space-time continuum- will Ash and his friends survive this showdown and learn Darkrai's true nature? 
(Source: DVD Cover [English Version])