The Eon Duo contains Latias and Latios. They are a pair of Legendary Pokémon that appear in the Hoenn region. Unlike many other legendary groups, Latias and Latios each have genders, and they share the same type and abilities, as well as having a mutual held item: the Soul Dew. The only non-visual differences between the two of them are their movesets and the distribution of their stats. According to the fifth Pokémon movie and several games, Latias and Latios are considered brother and sister.
|Dragon/Psychic||Levitate||Latias is the female member of the two, and is generally more timid than her counterpart, Latios. Latias's stats are more suited for defense. Her signature move is Mist Ball.|
|Latios is the male member of the two, and is generally more brave than his counterpart, Latias. Latios's stats are more suited for attack. His signature move is Luster Purge.|
- The Eon Duo is the first group of Legendary Pokémon in which all of its members have determined genders.
- With three different items between them, the Soul Dew, the Latiasite and the Latiosite, Latios and Latias are the only Legendary Pokémon to have two different sets of items exclusive to each of them, each with their own effects.
- The Eon Duo appears to share the same triangle hole marks as Togepi Evolutionary Line. However, their connection had been theorized and remained unknown.