This Tangela is a grass-type Pokémon owned by Erika.
Erika's Tangela acidentally stood in Red's path when he wanted to ride the bike to Celadon City. Later, Erika used Tangela to battle Red's Ivysaur and won by hitting the latter with Vine Whip.
Erika came with her Pokémon, including Tangela, to meet up with Yellow near Celadon City.
Erika sent her Tangela to battle the Shellder army, invading the Celadon City. Tangela used Bind, but the Shellder broke free from its grasp. The Shellder attacked Erika, who was saved by Tangela; Tangela used Bind and Growth, to absorb some of the energy. With Lance's downfall, Erika and Tangela watched as the light from Yellow and Pika's Megavolt caused the area around the city to bloom with flowers, restoring it with life.