Cynthia/Games

Cynthia makes her first appearance in, where she meets up with the undefined at various points during their journey. She will first meet the player in Eterna City, where she will give them when first met. In Platinum only, she will give the player a  after the player has defeated Jupiter in the Team Galactic Eterna Building. At Valor Lakefront, she gives the player the SecretPotion to cure the blocking. After the player cures the Psyduck, Cynthia appears again and gives the player the Old Charm to deliver to her grandmother. Later, she appears at the as the.

In Platinum only, Cynthia also appears at the Spear Pillar once Cyrus has been dragged into the Distortion World by, and will guide the player through the said world in order to confront Giratina. During the post-game, she will appear at the Celestic Town ruins and tell the player about them.

In, Cynthia makes an appearance in the Sinjoh Ruins, doing further investigation on the origins of and the creation trio. If the player has an Arceus with a fateful encounter marker or from the Hall of Origin when they visit the Ruins of Alph, the player will be teleported to the Sinjoh Ruins. Inside a cabin at the ruins, the player will find Cynthia, who will tell the player that Arceus will let them obtain a level 1, , or. If the player returns to the Sinjoh Ruins with another Arceus (that doesn't have the same origin as the one they used the first time), they will be informed that Cynthia has returned to Sinnoh, and the event will run without her.

In Generation V, Cynthia appears in a house in Undella Town, where she can be battled. She leaves after being defeated for the first time and afterwards reappears during spring and summer. During spring, she can be rebattled once a day. After defeating her, Shauntal and Caitlin can be seen visiting this house in the spring, and, in only, Lenora, Elesa, Iris, and Skyla visit in the summer. In Black and White, she speaks about a  who defeated her, and mentions that Trainer defeated, referring to the events of Platinum. In, Cynthia can also be battled in the Champions Tournament at the Pokémon World Tournament.

In Pokémon Sun, Moon, Ultra Sun, and Ultra Moon, Cynthia appears in Alola's Battle Tree as an opponent that the player can battle and subsequently recruit.

Cynthia is very interested in mythology and history, and spends her time researching and exploring various sites associated with Legendary Pokémon of the Sinnoh region. Her family lives in Celestic Town, although her own hometown was not mentioned. She is implied to have helped Professor Rowan with his Pokédex and embarked on an adventure as a child, similar to the player.