Pluton's reputation as one of the three Ancient Weapons in 'One Piece' definitely makes it a contender for the title of 'strongest,' but I don't think it's that simple. The series has teased its power for years, with characters like Crocodile and the World Government desperate to control it. Yet, we still haven't seen it in action—only heard about its ability to destroy entire islands. That kind of destructive potential is terrifying, but 'One Piece' also introduces other powerhouses like Poseidon (controlling Sea Kings) and Uranus (still shrouded in mystery). Pluton might be the most conventional weapon, but 'strongest' depends on context. Is raw destruction the only measure? What about the strategic value of Poseidon's sea dominance or Uranus's unknown capabilities? Oda's world-building loves to balance power with consequences, so I wouldn't be surprised if Pluton's strength comes with a heavy cost or limitation.
Plus, let's not forget the Straw Hats' own growth—Luffy's Gear 5 and Zoro's Enma upgrades show that individual power can rival legend-tier weapons. Pluton might be a relic of the past, while the new generation writes its own rules. The idea of 'strongest' in 'One Piece' feels fluid, like the sea itself.