As a Pokémon expert, I can tell you that determining the most powerful legendary Pokémon is a complex task because it depends on various factors such as the game version, the specific battle scenario, and the strategies employed by the trainer. However, some legendary Pokémon are often cited as being particularly powerful due to their high base stats, unique abilities, and the moves they can learn.

In the context of competitive battling, Mewtwo is often considered one of the most powerful due to its impressive Special Attack and Speed stats. Its ability to learn a wide range of moves, including powerful Psychic-type moves and other types, makes it a formidable opponent. Additionally, its Mega Evolutions in Mewtwo X and Mewtwo Y further enhance its stats, making it a top contender in battles.

Another legendary Pokémon that is highly regarded is Greninja, which, while not traditionally a legendary, is considered a pseudo-legendary due to its high stats and being the final evolution of a non-legendary Pokémon. Greninja's unique ability, Protean, allows it to change its type to match the move it's about to use, which can be a significant advantage in battle.

In the most recent games, such as Pokémon Sword and Shield, Zacian and Zamazenta are also contenders for the title of most powerful, with their high stats and signature moves that can be very effective in battle.

It's important to note that the "most powerful" is subjective and can vary based on the context of the battle and the trainer's strategy. There is no definitive answer, but these are some of the legendary Pokémon that are often at the top of the list.

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Here are what could easily be considered eight of the best legendary Pokemon in the series, and seven of the worst.8Worst: Moltres.7Best: Lugia.6Worst: Uxie.5Best: Arceus.4Worst: Tornadus.3Best: Giratina.2Worst: Entei.1Best: Solgaleo.More items...read more >>