Pokémon 3: The Movie (劇場版ポケットモンスター 結晶塔の帝王 ENTEI Gekijoban Poketto Monsuta Kesshoto no Teio ENTEI, literally "Pocket Monsters the Movie: Emperor of the Crystal Tower ENTEI; officially POCKET MONSTERS Lord of the "UNKNOWN" Tower in Japan) is the third feature-length Pokémon movie. The original Japanese version was released in theaters on July 8, 2000, and the English adaptation was released on April 6, 2001 and was produced by Kids WB!, Nintendo, and 4Kids Entertainment. The movie seems to take place in modern midday. Many critics say this one is the best in the series.

Like its predecessors it has a 20-minute short film titled Pikachu and Pichu, which marks the debut of the mischievous Pichu Bros., who help Pikachu reunite with his trainer after being separated (without Ash even knowing, due to him preparing a party to celebrate the day Pikachu and himself first met).

It was also the last Pokémon movie released theatrically in the UK and in Chile.

Pikachu Movie: Pikachu & Pichu

Ash, Misty and Brock drop their Pokémon off on a park on top of a building while they set something secret up, Ash explaining they'll be back at 6:00 pm exactly. Pikachu takes interest in a pair of Pichu on an opposite skyscraper. Pikachu gets into trouble when he is attacked by Murkrow, falls off a pole, hops across a line of Hoppip and then sends Meowth (who is window cleaning) flying into a billboard, before joining the Pichu Bros. The Pichu tell Pikachu they can get him back to his friends but instead they go off towards their hideout, going on a wild ride across the city. On the way they upset a Houndour who chases after the three, but they escape when a Snorlax crushes the dog. Pikachu and the Pichu have fun at the Pichu's hideout but Houndour return, causing mayhem for them. The hideout becomes unstable and threatens to collapse, but the Pokémon all work together to save the hideout. Pikachu realises it is nearly six o'clock and he with the Pichu race back to the other Pokémon just in time. The Pichu Bros. bid farewell to Pikachu and head off. Ash, Misty and Brock return and reveal to the Pokémon that they surprised a party for them, because it is the anniversary of how Ash and Pikachu first met. The show ends with the narrator reflecting on how Pikachu both met Ash and the Pichu on the same day and how they may meet again.

Spell of the Unknown

Professor Spencer Hale (once one of Professor Oak's top students and a good friend of the Ketchum family), is obsessed with discovering the secret behind the mysterious glyph-like Pokémon called Unknown. One day while investigating some ruins, he disappears after encountering the enigmatic creatures, leaving his only daughter alone and lonely back at his mansion. When a shipment of tiles from the ruins arrive at the mansion, the girl's depression and desire for companionship invokes the Unknown trapped within them and causes them to use their reality-warping powers to seal off the mansion and the surrounding valley of Greenfield in crystals and create an image of the legendary Pokémon Entei to stand in for her father. When this proves to be not enough, the Unknown give in further to the little girl's wishes, having Entei kidnap Ash's mother Delia and brainwashing her into thinking she is the girl's mother, prompting Ash to charge head-first into the mansion on a rescue mission to not only save Delia, but also everyone else from the increasingly rampant and destructive powers of the Unknown, who are growing more and more manipulated by the impulses and feelings of Prof. Hale's daughter, crystallizing more and more of the environment within the mansion's vicinity.

Molly notices that Ash, Brock, and Misty are trying to enter the mansion. Delia sees this too and when she sees Ash, she snaps out of her trance. Molly proceeds to deal with the intruders by approaching them with a projection of sorts. When Brock says that she is too young, Molly "makes" herself older with Entei's power. Brock then challenges her first to a Pokémon battle, but loses to her own versions of super-powerful Pokémon, called Crystal Pokémon, created by Entei. Ash and Misty are about to head up the second set of stairs when they are encountered by the older Molly again, but this time Misty takes her challenge. Surprised that Misty is old enough to be a Gym Leader, Molly readjusts her age to match Misty's. She also changes the arena to an underwater setting. Yet even with the new advantage underwater, Misty still loses to Molly's Crystal Pokémon. Climbing up the stairs, Ash finally finds Delia with the real Molly, who is sleeping.

Delia is surprised to see Ash and with him, tries to convince Molly to leave and return to reality. However, Ash is then confronted by Entei who viciously defends Molly's feelings. Forced into battle, Ash uses Totodile and Cyndaquil against Entei however the two are easily beaten. Pikachu is not as easily defeated, and puts up a valiant fight against Entei. Ash's Charizard, who had seen Ash in trouble on Liza's television earlier and decided to help, returns from the Charicific Valley to save Ash and Pikachu after Entei sends them flying. Ash then mounts Charizard as Entei engages them, and a spectacular battle erupts. Charizard is more evenly-matched against Entei, and the two Pokémon throw everything they have at each other. At one point, Ash tries to talk Entei out of fighting and doing what's best for Molly, but Entei persists. Just as Entei is about to unleash a powerful blast at point blank range to finish Charizard off, Molly stops him, and decides she wants to live in reality again.

Unfortunately, the Unknown start to lose control of their combined Psychic powers after having fed off so much of Molly's feelings. Entei is forced to attack his creators in order to restore peace. With help from Pikachu and Charizard, Entei manages to penetrate the Unknown's shield and then stops their spell by hitting them with a Fire Blast. Entei bids farewell to Molly, telling her to keep him close in her dreams as he fades away. The Unknown proceed to return to their dimension, releasing Professor Hale. The group go outside and find that Greenfield has returned to normal. Team Rocket are trapped up in a tower with Wobbuffet but then they announce that they can attempt to be heroes next time and bid farewell with a cry of "Team Rocket's fading out again!"

In the credits, Charizard leaves to return to Charicific Valley, and Molly acquires a real Teddiursa along with the return of her mother and father.

From Wikipedia