In the world of One Piece, the Pluton is an ancient battleship that was created during the Void Century. According to the story, the Pluton was one of three powerful ancient weapons that were created to combat a powerful and mysterious enemy known as the “Great Kingdom.” The other two weapons are the Poseidon and the Uranus.

The Pluton was designed to be an incredibly powerful weapon capable of destroying entire islands with a single shot. The blueprints for the ship were kept hidden for centuries, and only a few individuals in the world of One Piece know of its existence.
In the storyline of One Piece, the Pluton has been a major plot point for many years. It has been rumored to be in the possession of various characters, and its existence has been the subject of many battles and quests.
One of the first characters to be associated with the Pluton was a shipwright named Tom, who was known for his incredible skill in creating ships. It was revealed that Tom had been forced to create the Pluton for the government, but had ultimately refused to give them the blueprints. Tom was eventually killed by the government, but not before he entrusted the blueprints to his apprentice, a cyborg named Franky.
Franky eventually became a member of the Straw Hat Pirates, and the blueprints for the Pluton were passed down to him. However, Franky was reluctant to reveal their existence, as he believed that the Pluton was too dangerous to be used as a weapon.
Over the course of the series, various characters have sought out the Pluton, either in order to obtain its power for themselves or to prevent it from being used by others. One of the most significant of these characters is the pirate Crocodile, who was the primary antagonist of the Alabasta Arc.
Crocodile was a former member of the Shichibukai, a group of seven powerful pirates who had allied themselves with the government. It was revealed that Crocodile was obsessed with obtaining the Pluton, and had been manipulating events in order to gain access to the blueprints.
Ultimately, the Straw Hat Pirates were able to defeat Crocodile and prevent him from obtaining the Pluton. The blueprints were destroyed, and it was believed that the Pluton was lost forever.
However, it was later revealed that the government had a backup set of blueprints for the Pluton, and that they had been using them to create their own version of the ship. This version of the Pluton was called “Pluton II,” and it was eventually revealed to be a fake, designed to lure out anyone who might be seeking the real Pluton.
As of the current point in the One Piece storyline, it is unclear who, if anyone, currently possesses the real Pluton. However, it is likely that the Pluton will continue to be a major plot point in the series, as it is one of the most powerful weapons in the world of One Piece and could have significant implications for the balance of power among the various factions in the story.