Sina is a character appearing in Pokémon Adventures, who is an assistant of Professor Sycamore.
Sina is a dark-skinned woman with black hair. She wears a white outfit with grey lines, consisted of a shirt with buttons and a skirt. She also wears white boots. In addition, she wears a red scarf, and is sometimes seen with a red mask on.
Sina, along with Dexio, is a loyal assistant to Sycamore. Sometimes, she and Dexio make slight mistakes, but they mean well.
X & Y arc
Sina and Dexio, wearing masks, watched as the Vaniville Town group took a Charmander with them. Inside the city, Sina and Dexio encountered the group, claiming they stole the Charmander. They snatched Charmander, but Tierno caught up to them and took Charmander. The group explained Charmander followed them, so Sina and Dexio led the group to Professor Sycamore. Sina and Dexio accompanied Professor Sycamore and X, as they were to meet up with the latter's friends. Since Sycamore was to be interviewed at the Prism Tower, he had Sina and Dexio return to his lab.
Sina and Dexio were sent to investigate the Lysandre Cafe. However, Team Flare had been aware of this and left the Cafe before they arrived. Sina and Dexio fought against a garçon and intimidated him. They reported to Sycamore how Team Flare went to the Pokémon Village. Wikstrom explained the group how Team Flare knew that Sina and Dexio invaded the cafe, and likely had set up traps to stop the group from reaching the Pokémon Village.
After Team Flare was defeated, Blue and Blaine reported to Sycamore how they saw a green blob fleeing the scene. Sycamore suspected it was related to Zygarde, and the blob was seen also in Alola. Thus, he had Sina and Dexio go to that region to investigate more.