The canon strengths of Legendary Pokémon are common in the community, but Legendary trios are iconic monsters and often the center of the debate. Since Kanto introduced Articuno, Zapdos, and Moltres, the Pokémon world has continuously developed new monsters with similar themes and designs. The upcoming Pokémon Scarlet and Violet games have yet to reveal the new Legendary trio, but it's unlikely its additions will defeat the most powerful existing trio. Now that Nintendo and Game Freak have removed the National Pokédex mechanic from the core series, it's unlikely for fans to be able to pit every trio against one another, leaving several match-ups to become purely theoretical.
Most Pokémon generations feature a Legendary trio, usually reflecting some of the themes in the region or the story. A Legendary trio often shares similar typings, designs, and story origins, but these rules can vary depending on the region. For example, Pokémon Sword and Shield's Legendary trio includes Zacian, Zamazenta, and Eternatus, with the latter's design and abilities drastically different from the accompanying hounds. Pokémon Sapphire, Ruby, and Emerald also feature a unique trio that fails to provide many similarities, with Groudon, Kyogre, and Rayquaza sporting different inspirations, typings, and habitats. However, different designs and stories rarely contribute to the individual strength of a Pokémon.
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