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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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)

This is the 8th Movie. 
In the town of Lohta, a festival is thrown praising "Aaron the Wave Leader Hero" who, according to the legend passed down through the town's generations, stopped a war centuries ago by using the power of "the Tree of the World's Origin." Satoshi and Pikachu participate in a battle to decide this year's hero and after their victory, they are chosen as the "Wave Leader Hero." A grand dance party is held in the castle to celebrate the victor, but suddenly the phantom Pokemon Mew appears and takes Pikachu. Soon afterwards, the Wave Leader Pokemon "Lucario" is freed from his centuries-long seal and meets Satoshi. Satoshi must solve the various mysteries of where Pikachu is, what Mew's after, what the secret of the legend of the Wave Leader is and how it ties in with Lucario's hidden past as he makes his way to "the Tree of the World's Origin" with Lucario. 
(Source: Anime News Network)

This is the 6th Movie. 
Satoshi, Haruka, Takeshi, and Masato come upon the festival of the Wishing Star of Seven Nights. During their enjoyment, the legendary pokemon, Jirachi, decends from the heavens and befriends Masato. Jirachi, with the power to grant any wish, is sought after by many people wanting to claim its power. One man seeks to use its legendary power to revive an ancient pokemon known as Groudon, unaware of the dangers hidden within Jirachi's powers 
(Source: Anime News Network)

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!

Satoshi and his friends travel to LaRousse, where they meet a boy named Tooi who is afraid of Pokemon due to an incident that happened four years earlier. Meanwhile, Deoxys, a Pokemon from space, has reappeared, putting a barrier around the city and kidnapping people. Rayquaza, a Pokemon that lives in the atmosphere, comes to fight it. 
(Source: Anime News Network)

As with both the Advanced Generation and Diamond &amp; Pearl series before it, the Best Wishes! series begins with only Ash Ketchum, headed off to the Unova region, located far away from Kanto, Johto, Hoenn and Sinnoh, with his Pikachu. After he meets up with the new trainer and rival Trip and the region's Professor Juniper, he gains traveling companions in Iris, a girl from a town known for its Dragon Pok&eacute;mon, and Cilan, Pok&eacute;mon Connoisseur and the Grass Pok&eacute;mon specialist of the three Straition City Gym Leaders. 

Satoshi, Iris & Dent continue their travels through the Isshu region. After successfully winning his eighth and final Gym Badge against Homika in Tachiwaki City, Shirona invites everyone to stay at her villa in East Isshu, where old friend Hikari is also staying and where they participate in the Pokémon World Tournament Junior Cup after which Satoshi participates in the Isshu League. Team Rocket, meanwhile, initiate their final plan for the Isshu region-what is their purpose in their desire for the legendary Pokémon Meloetta?

After their encounter with Team Plasma, Satoshi, Iris and Dent start a new journey in the Decolore Islands.

In this new series, Satoshi, Pikachu and friends start a new journey towards the "White Ruins." There, they meet the young "N", who can hear the voices from Pok&eacute;mon's hearts... The door of truth leading to an Utopia for Pok&eacute;mon and humans now lies open!

The 15th Pokemon movie and the 2nd 'Best Wishes!' movie. It will feature the legendary Pokemon Kyurem (appearing also in its new Black Kyurem and White Kyurem formes.) The Legendary Musketeer Pokemon-Cobalion, Terrakion and Virizion-will appear alongside their newly revealed 4th member, Keldeo.

The 16th Pokémon movie and the 3rd "Best Wishes!" movie.

One of the two Pokémon Best Wishes movies that will premiere simultaneously on July 16th. The two titles are: 
Pokémon Best Wishes! the Movie: Victini to Kuroki Eiyuu Zekrom 
Pokémon Best Wishes! the Movie: Victini to Shiroki Eiyuu Reshiram 
The stories of the two movies will be the same until Satoshi and Pikachu meet Victini but the legendary Pokémon will be either Zekrom or Reshiram.

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.

Many millennia ago, a meteor from space which threatened to destroy the world was stopped by Arceus who intervened to protect the world. While attempting to protect the world, Arceus was badly injured and Damos (&#12480;&#12514;&#12473;) took care of it. As gratidude, Arceus promised to help make the desolate land of Mich&#299;na rich and prosperous so it gave Damos the Jewel of Life (&#21629;&#12398;&#23453;&#29577;). 
Arceus let Damos borrow 16 parts of its body to create the Jewel of Life which were to be returned to it on a specific date. Arceus was betrayed when it was not returned and it vowed to judge humans when it awakens. 
Many millennia after these events, Satoshi, Hikari and Takeshi arrive in the riverside town of Mich&#299;na (&#12511;&#12481;&#12540;&#12490;) which is surrounded by nature's beauty. They decide to go the ruins of Mich&#299;na which are at the summit of a large rock. There is a large and beautiful lake at its shores and Satoshi and friends are fascinated by the lake, but suddenly, waves begin to form in the lake and tornado of water begins to wreak havoc. 
A descendant of Damos, a girl called Sheena, runs out from the ruins of Mich&#299;na. Sheena saw what was happening and she summoned Dialga and she says "Dialga, please!" and Dialga manages to stop the tornado. 
Satoshi and his friends finally get to see the ruins and Kevin and Sheena tell the old legend of Mich&#299;na to Satoshi and his friends. Moments after they explain the legend, the fighting between Dialga, Palkia and Giratina becomes fierce and the ruins of Mich&#299;na are destroyed. Arceus is awoken... 
(Source: Pocketmonsters)

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])

The Fury of Zoroark Has Been Unleashed! 
The Pok&eacute;mon Baccer World Cup. 
It is the most anticipated event of the year, and as hundreds flock to Crown City to watch the exciting competition unfold, Ash, Pikachu, and his friends encounter a mysterious new Pok&eacute;mon they have never seen before. 
But when the three Legendary Pok&eacute;mon Raikou, Entei, and Suicune suddenly arrive and begin rampaging through the streets, it&rsquo;s up to Ash and his companions, along with their new Pok&eacute;mon friend Zorua, to uncover the secret behind the immense and powerful forces at work. 
What strange and dangerous powers are afoot in Crown City? Why did Celebi suddenly return after vanishing for twenty years? And why is the mighty Zoroark unleashing its fury upon the town? The quest for these answers leads down an uncertain path filled with peril&mdash;can Ash and his companions find enough courage, strength, and friendship to unearth the mystery in time to save Crown City? 
(Source: Pokemon.com)

On the other side of the world, there exists another mysterious, mirror-like dimension known as the Reverse World. In this unique space lives the legendary Pokemon Giratina, a god-like Pokemon who soon finds itself in a great struggle with the legendary Pokemon Dialga! Why are these two Pokemon fighting? And what is the secret of this Reverse World? 
Meanwhile, Satoshi and his friends are traveling when they are greeted by yet another legendary Pokemon, Shaymin. This cute and somewhat cheeky Pokemon holds the secret to the battle between the two god Pokemon, but something unexpected happens to it during its journey. In order to save both worlds, Satoshi joins forces with it to stop the fighting once and for all!

Episodes of the Pocket Monsters anime which occasionally aired instead of a rerun from the main anime series as part of the Weekly Pokémon Broadcasting Station in Japan. They aired concurrently with Pocket Monsters Advanced from December 3, 2002 to September 28, 2004 in Japan. Outside of Japan, these episodes were only dubbed in the West as part of Pokémon Chronicles. 
(Source: Bulbapedia) 
Note: The Japanese version comprised 16 episodes while the U.S. version comprised 22 episodes; this page represents the Japanese version. The 6 additional episodes in the U.S. version were taken from previous movies and specials. Episodes 1, 2, and 3 are from Pokémon: The Legend of Thunder!, Episodes 4 and 20 are from Pokémon: Pikachu's Winter Vacation (2001), and Episode 22 is from Pokémon: Pikachu's Winter Vacation

40 years ago, a Celebi was being attacked by a Pokémon Hunter. Luckily, a young boy named Sammy saved Celebi. Using its Time Traveling power, Celebi transported himself and Sammy 40 years into the future. There, Ash, Misty, and Brock assist Sammy to the healing lake in the forest so they can heal the wounded Celebi. Unfortunately an evil Team Rocket member, Viscious a.k.a. "The Iron Masked Marauder", tries to capture Celebi using his technology. As Ash and Co. try to get away from Viscious, they also run into Jessie, James, and Meowth, who also want to capture Celebi. Soon it becomes a race against time to get Celebi and Sammy back to the forest before Celebi is caught and is used to destroy the forest and themselves. 
(Source: Anime News Network)

Young Molly Hale is a 5-year old girl who has lost her father to the Unown, a strange group of Pokémon who can make a person's dreams real by using their Psychic energy. One day she accidently releases the Unown, and they begin to answer Molly's wishes; first by creating Entei, a legendary lion-like Pokémon who Molly then thinks is her father because he always pretended to be Entei when he played with her. Molly then feels lonely because she has no mother, so Entei decides to kidnap Ash's mother and forces her to become Molly's. Ash, Brock, and Misty must then try to save Ash's mom, Delia, and Molly; And in the process they must also try to find a way to stop the Unown from turning the town of Greenfield into a bizarre crystal wasteland. 
(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 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)

The Team Rocket leader, Giovanni, has found Mewtwo in a remote area of the Johto region. As Giovanni tries to re-capture Mewtwo, Ash and his friends are kidnapped by Domino, a new Team Rocket member, while trying to rescue Pikachu from Jessie and James. The Clone Pokemon are also captured and are then used as bait for Mewtwo. The situation then becomes a battle between the wills of Mewtwo and Giovanni; and Mewtwo also tries to discover if it and the clones have a purpose in life, even though they are products of science. 
(Source: Anime News Network)