Best Legendary Pokémon in Every Generation: Gen I to IX

There is no single objectively best Legendary Pokémon across all nine generations, because “best” can mean strongest in battle, most useful in a particular game, or most memorable in the story. If one overall pick is needed, Arceus has the strongest case: its ability to change type gives it exceptional flexibility, while each generation has a standout for its own games and competitive format.

What “best” means for a Legendary

Legendary Pokémon are rare, powerful Pokémon central to many games’ stories, but the label does not guarantee that one will be the strongest choice in every battle. A Pokémon’s performance depends on its moves, ability, stats, format rules, available teammates, and whether it is being used in a story playthrough or competitive play.

This list chooses one representative for each generation by balancing battle potential, distinctive mechanics, and importance to its games. It is a reasoned selection, not an official ranking. Mythical Pokémon, such as Mew, Celebi, and Mewtwo? Mewtwo is Legendary; Mew is Mythical. Mythical Pokémon are generally distributed differently and are treated as a separate category, so they are not included as the generation’s pick here.

Best Legendary Pokémon by generation

• Generation I — Mewtwo: The standout of the original games, Mewtwo has exceptionally high Special and Speed in the original Generation I stat system, plus a memorable role as a post-game challenge. Its Psychic typing was particularly powerful in those games. Later games changed the battle environment and added counters, so its original dominance should not be assumed in every format.
• Generation II — Lugia: Lugia combines a deep defensive profile with the signature move Aeroblast and a major story role in Pokémon Silver. Its Psychic/Flying typing gives it useful resistances and immunities, though weaknesses such as Electric, Ice, Rock, Ghost, and Dark matter in team planning. Ho-Oh is a close alternative, especially for players who prefer offense and its Fire/Flying typing.
• Generation III — Rayquaza: Rayquaza is a powerful Dragon/Flying Pokémon with a central role in the Hoenn story and a later Mega Evolution in games that include Mega Evolution. Its ability to Mega Evolve without holding a Mega Stone made it especially unusual in the relevant formats. It is not available in every game, and competitive rules may restrict it.
• Generation IV — Arceus: Arceus is the most persuasive all-round pick. Its Multitype ability changes its type when it holds a Plate or, in later games, a type-specific memory-compatible item, depending on the game’s mechanics. That lets it adapt its typing to a team’s needs. It is Mythical, despite often being discussed alongside Legendary Pokémon, so access and event availability can differ from ordinary in-game Legendary encounters.
• Generation V — Zekrom: Zekrom is a powerful Dragon/Electric Legendary with a defining role in Pokémon Black and the broader Unova story. Its signature move, Bolt Strike, gives it a distinctive physical Electric attack. Reshiram is an equally legitimate counterpart choice, with Dragon/Fire typing and a special-attacking focus; which is better depends on the team and game.
• Generation VI — Xerneas: Xerneas is a Fairy-type Legendary whose signature move Geomancy can sharply boost its stats when used with a Power Herb in formats where both are available. This combination made it a major competitive threat in some rulesets. It is not universally dominant: restrictions, available items, and opponents’ answers change its value.
• Generation VII — Necrozma: Necrozma stands out for its story importance and multiple forms, including powerful fusions with Solgaleo or Lunala in relevant games. Its forms have different typings and battle roles, so “Necrozma” is not one fixed set of strengths. Ultra Necrozma is a particular form available through a specific game mechanic, not a form usable in every Pokémon title.
• Generation VIII — Zacian: Zacian (Crowned Sword) became a major competitive force in formats that allowed it, thanks to its Fairy/Steel typing, high offensive stats, and ability Intrepid Sword. Its Crowned Sword form requires the Rusted Sword in games that use that item. Rules have changed across formats, so its reputation does not mean it is legal or the best choice everywhere.
• Generation IX — Miraidon: Miraidon is a strong pick for Pokémon Scarlet and Violet, with Electric/Dragon typing, the Hadron Engine ability, and a role tied to the game’s futuristic theme. Its ability can create Electric Terrain, which supports certain strategies. It faces format restrictions like other exceptionally powerful Pokémon, and Koraidon is a compelling alternative for players who prefer Fighting/Dragon and physical offense.

Why Arceus has the best overall case

Arceus earns the overall pick through adaptability rather than a claim that it wins every matchup. Changing type can alter its weaknesses, resistances, and offensive options, making it unusually flexible across team concepts. Its base stats are evenly distributed, which also allows different roles depending on the chosen moves and type.

There are important qualifications. Arceus is a Mythical Pokémon, not a standard Legendary, and it is not obtainable in the same way in every game. Some competitive formats ban or restrict it. If the question means “best Legendary, excluding Mythical Pokémon,” Mewtwo is a strong overall answer for historical impact, while Zacian or Miraidon may be better picks for specific modern formats.

How to choose one for your game

For a regular story playthrough, choose based on when you can obtain the Pokémon, whether it fits your team, and whether you enjoy its design or story. A theoretically powerful Legendary may arrive near the end of the game, leaving little time to use it. Some games also limit which Pokémon can be transferred or used.

• For a dramatic story role: Consider Lugia, Rayquaza, Zekrom, or Necrozma.
• For flexible battle options: Arceus has the clearest type-changing advantage, where available.
• For a generation-specific competitive pick: Check the exact game and ruleset; Zacian and Miraidon have both been format-dependent.
• For personal preference: Legendary status does not make a Pokémon mandatory. A well-rounded team can succeed without using one.

Also distinguish a Pokémon’s power in its debut generation from its performance now. Changes to stats, moves, abilities, battle mechanics, and competitive rules can all affect rankings. Mega Evolution, for example, exists in some games and formats but not others.

Common misconceptions and useful context

“Legendary” does not mean “unbeatable,” and a strong reputation is not a guarantee of availability. Story battles are usually designed differently from competitive matches, where players can plan around a Pokémon’s typing, moves, and predictable role. A Legendary can be a useful team member without being the best choice for every situation.

Another frequent point of confusion is the difference between Legendary and Mythical Pokémon. The games and franchise treat them as distinct categories, although casual discussions often group them together. Arceus, Mew, and Celebi are Mythical; Mewtwo, Lugia, and Rayquaza are Legendary. Including Arceus as the overall pick therefore depends on using “legendary Pokémon” loosely to mean rare, powerful special Pokémon. Under a strict category, choose a Legendary instead.

Frequently Asked Questions

Who is the strongest Legendary Pokémon overall?
There is no universal answer because games and competitive formats differ. Arceus is a strong all-around choice if Mythical Pokémon are included; Mewtwo is a strong candidate if they are excluded.

Is Arceus a Legendary Pokémon?
Arceus is classified as a Mythical Pokémon, a category distinct from Legendary Pokémon. It is often included in broad discussions of the strongest rare Pokémon, which explains why it appears in many informal rankings.

Is Mewtwo stronger than Arceus?
It depends on the game, movesets, and rules. Mewtwo has a long history as a powerful attacker, while Arceus can change type and fill different roles. Neither is automatically superior in every matchup.

Which generation has the best Legendary Pokémon?
That is subjective. Generation I introduced Mewtwo and the legendary birds; later generations added distinctive mechanics and story roles, including Rayquaza’s Mega Evolution and Arceus’s type-changing ability.

Are Legendary Pokémon always allowed in competitive battles?
No. Rules vary by game, tournament, and format. Some allow many Legendary Pokémon, while others restrict or prohibit specific species, so check the rules for the exact competition.

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