Pietra

Pietra (Japanese: エリコ Eriko) is a character of the day who appeared in Right On, Rhydon!. She also appeared in the Ash & Pikachu manga.

In the anime
Pietra's grandmother sprained her ankle and Pietra wanted to make it easier for her to travel through the mountain by digging a hole in it. She was using  to try to achieve this. They nearly got through but when they started to dig deeper, water began to drip on them and they got scared and ran away. Hence she resolved to capture a certain which was able to use  and as such, wasn't afraid of water.

Pietra met and  and together they came across Rhydon. It escaped into the lake, however. Ash and used their Water Pokémon to help search for it. Pietra used her boat to go out on the lake. Soon, discovered Rhydon by accident and bit on its horn, angering it. Pietra tried to it but was unsuccessful after it used  in the water and caused a whirlpool.

They then traveled over to a small island where they saw Rhydon coming to shore. Pietra encountered it again, but interfered and tried to take it for themselves. Ash assisted in stopping them and the Rhydon jumped back into the lake. Pietra jumped into the lake after it and grabbed it. Rhydon carried her under water but she refused to let go until it battled her, and eventually the Rhydon finally gave in and agreed.

She used her to battle and defeat Rhydon, which allowed her to  it. She then used her newly caught Rhydon to complete the tunnel.

In the Ash & Pikachu manga
Pietra appeared in The Grand Rhydon Plan.. She goes by the Japanese name, Eriko, in Chuang Yi's English translation.

Trivia

 * A Lean Mean Team Rocket Machine! features a girl with the same character design as Pietra.

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