From Bulbapedia, the community-driven Pokémon encyclopedia.
A legendary duo is a pair of closely related Pokémon, either representing teamwork or opposition. Much like how every region has a legendary trio, every region, besides Unova, also has a legendary duo. In the games, they are often found after the player gets past the Elite Four but often aren't as important in the main storyline as the trios are. Duos are featured in several of the movies, either in their respective pairs, or on their own, as a keeper of peace. Sometimes pairs of Pokémon once thought to be legendary duos are revealed to actually be legendary trios upon the release of the third version. A primary example would be Dialga and Palkia.
Every generation but Generation V has introduced at least one legendary duo. Duos introduced in even generations tend to be opposites, like Lugia and Ho-Oh. Conversely, duos introduced in odd numbered generations tend to be more closely related, such as Latios and Latias. No duo was introduced in Generation V.
The Mew duo
Mewtwo and Mew make up Kanto’s legendary duo. They are both Psychic-type Pokémon that are very elusive. Mewtwo was cloned from Mew, meaning the two share DNA and many traits.
In Mewtwo Strikes Back, Mew embodied innocence and joy, but Mewtwo's experiences as he gained consciousness gave him a jaded and cynical view of humanity. The duality expressed between the two characters formed the basis of their conflict, but innocent Mew, with the help of Ash Ketchum, is able to sway Mewtwo's contempt.
The Tower duo
Lugia and Ho-Oh in promotional art for the TCG
The Tower duo is the legendary duo of Johto that consists of Lugia and Ho-Oh. Lugia and Ho-Oh are often regarded as polar opposites. Lugia represents the moon, sea, storms, the color silver and is the mascot of Pokémon Silver and Pokémon SoulSilver, while Ho-Oh represents the sun, sky, rainbows, the color gold, and is the mascot of Pokémon Gold and Pokémon HeartGold. Both are also trio masters; Lugia is the master of the legendary birds, while Ho-Oh is the master of the legendary beasts.
Their legend is introduced in Generation II, and states that the two birds each resided on a tower: Lugia on the Brass Tower, and Ho-Oh on the Bell Tower. When the Brass Tower was destroyed in Johto (prior to the start of the second generation games), the pair was split up thus creating the legendary beasts: Entei, Raikou, and Suicune.
The Eon duo
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Latias and Latios artwork
The Eon duo is a legendary duo of Hoenn that consists of Latias and Latios They are region's roaming Pokémon and they share their typing, four of their base stats and even several moves they learn when they level up. Both were featured in the movie Pokémon Heroes, where they were revealed to be playful siblings.
Latios and Latias take on counterpart availability in Pokémon Ruby, Sapphire, and Emerald as well as Pokémon HeartGold and SoulSilver, with Latios being a roaming Pokémon in Ruby and SoulSilver, and Latias doing the same in Sapphire and HeartGold. In Emerald, after the player has defeated the Elite Four, their mother will ask if the Pokémon mentioned on TV was red or blue, and depending on that, one of the two will be roaming Hoenn. The other member of the duo will be found on Southern Island, accessible by Eon Ticket, in Ruby, Sapphire, and Emerald, and in Pewter City, through the Enigma Stone event, in HeartGold and SoulSilver.
In the anime, they debuted in Pokémon Heroes, and were the focus of the movie.
The Lunar duo
The Lunar duo is a legendary duo of Sinnoh that consists of Cresselia and Darkrai. Cresselia and Darkrai are commonly seen as polar opposites, just like the aforementioned Johto bird duo of Lugia and Ho-Oh. Cresselia and Darkrai are also known as the subconscious duo because of how Darkrai is said to give people nightmares, while Cresselia does the opposite (giving people pleasant dreams). Furthermore, Cresselia and Darkrai also appear in Pokémon Mystery Dungeon: Explorers of Time, Explorers of Darkness and Explorers of Sky as enemies.
They made their anime debuts in Sleepless in Pre-Battle! where they battled one another.
- Both Lugia and Ho-Oh were seen in the anime before Generation II was introduced; Ho-Oh was seen in the Pokémon - I Choose You! and Lugia was seen in The Power of One.
- They are also the only trio masters to be a part of a legendary duo.
- Also, Latias and Latios were also seen in the anime before Generation III was introduced. Both were seen in Pokémon Heroes, the fifth movie.
- Latias and Latios is the only duo who is always seen to live in peace.
- The Lunar duo is the only duo that has Pokémon which aren't next to each other in the Pokédex.
- Furthermore, the Lunar duo is the only duo that doesn't have any Pokémon in a regional Pokédex.
- The Lunar duo are also the only duo not to share at least one type.
- In every duo there is at least one Template:Type2 Pokémon.
- Despite Mewtwo being an altered clone of Mew, and therefore, they are closer that any other duo, statistically they are very different; with different stat totals, unrelated stat distribution, and divergent level up movesets; in those fields, Mewtwo seems closer to Lugia and Ho-Oh, while Mew seems more vinculated to Celebi, especially in gens II and III.