Sierra is a character appearing in Pokémon: BW Rival Destinies.
Season 15: Rival Destinies
Sierra, when she was a child, was a member of an archaeologist club and played with her colleagues, along with Ferris, despite claiming he was an inferior archaeologist.
Years later, after Ferris uncovered a fossil, she doubted him, as he thought it was a fossil of a Tirtouga he claimed he met years ago. However, Team Rocket captured the fossil, so she went with Iris and Cilan to track down their air ship. Upon seeing Tirtouga revived, she started believing Ferris' story is actually true. She also helped Carracosta to flee through the Time Gate.
|BW077||A Restoration Confrontation! Part 1|
|BW078||A Restoration Confrontation! Part 2|