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Tierra (Japanese: ナツキ Natsuki) is a character of the day who appeared in Control Freak!. She is an archaeologist who was trying to find a secret chamber in which a magical mask and staff, which had the power to control the minds of Pokémon, was supposed to be located.
Brock's Golbat led the group to Tierra, who was found lying unconscious among her dig site and broken equipment. Tierra was grateful and invited the group to her site office where she showed them the ancient tablet that had inspired her solo archaeological study. Meanwhile, Brock helped repair her equipment, and he upgraded her laptop to be compatible with Golbat's Supersonic waves. After learning that Tierra's digging machine had been destroyed, Brock also used his Geodude to Dig to the underground temple site.
Unfortunately Team Rocket had already reached the ancient temple first, thanks to their Dig-a-Tron. Tierra was shock by Jessie's belligerence after she put on the mask and began to wield the scepter's power for her own purposes. Team Rocket reduced the underground temple to rubble during their escape in their mecha, though Tierra and the others emerged unscathed from the debris. After Team Rocket were blasted off by Pikachu's efforts, Tierra gained possession of the mask and staff to continue her research.
- Tierra's name may come from the word tiara, a symbol of power, similar to the mask in the episode she appeared in. It may also come from the Latin word terra, meaning "earth". This may come from the fact that, being an archeologist, she works with earth.
- However, in the Castilian Spanish dub she was named Marina, which means "from the sea", possibly because Tierra is not a given name in Spain, but a common noun ("earth").