Watch Pokemon Movie 12: Arceus - Choukoku no Jikuu e Online

Constantly moving throughout the ocean the Temple of the Sea exists invisible to human eyes. It is here that the Sea Crown exists. Phantom the Pirate has captured the egg of a Manaphy, the only Pokémon able to locate the temple. However, his plans are ruined when Jack Walker, a Pokémon Ranger, interferes. Along the way, Ash Ketchum and his friends manage to get caught up in the adventure to return Manaphy to it's home. But along the way Manaphy and May form a special bond.

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.

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.

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.

Long ago, on an island called Altomare, there lived an old man and woman. One day, the couple found two small children lying on the shore, badly wounded. The couple took them in and took care of them, and the children quickly recovered. But then, the island was attacked by monsters. Within moments the island fell into the monsters' wrath. But then...Before the old man and lady's eyes, the children who they had taken care of transformed into the Eon Pokemon, Latios and Latias. They called their family from the sky. They came, and carried a stone with them containing the power to force the monsters away. This gem was known as the "Soul Dew". Peace returned to the island. However, later in the present, a criminal duo - Zanner and Lions - are seeking Latios and Latias in order to take control of the Soul Dew. Taking a short break in Altomare, Satoshi befriends Latias and is now dragged into the situation helping to save Altomare from becoming swallowed up by destruction again.