• English / United States: Whitney's Miltank
• Japanese / Japan: アカネのミルタンク
• Japanese (Romanized) / Japan: Akane no Miltank
• Japanese (TL) / Japan: Akane's Miltank

Miltank was the third and final Pokémon used by Whitney in the Goldenrod City Gym Battle against Ash Ketchum. Despite being down 3 Pokémon to 1, Whitney's Miltank was able to defeat Ash's Cyndaquil, Ash's Totodile, and Ash's Pikachu in succession with its powerful Rollout attack, giving victory in the match to Whitney.

Later, while at Milton's Miltank Dairy Farm, Ash Ketchum attempts to brush Whitney's Miltank and grabs it by its tail. Upset, Miltank kicks Ash Ketchum backwards and sends him flying into a nearby fence. Milton then informs Ash Ketchum that Miltank doesn't like to be grabbed by its tail.

After leaving the dairy farm, Whitney takes Miltank to a nearby hill to train. During the training session, Team Rocket appears and steals both Miltank and Ash's Pikachu. After Ash Ketchum was successful in retrieving both the Pokémon, he challenges Miltank to a battle, which if he wins, gives him another shot at the Plain Badge.

In the rematch, Miltank faces off against Ash's Cyndaquil. Ash's Cyndaquil was able to hit with a Flamethrower attack, but Miltank ultimately won the round with Rollout. Next, Miltank was able to defeat Ash's Totodile as well, but Ash's Totodile was able to carve out some ditches in the ground before losing. Miltank then went up against Ash's Pikachu. The ditches carved out by Ash's Totodile sent Miltank's Rollout attack off course. Ash's Pikachu was then able to hide in a ditch and hit Miltank from below. Ash's Pikachu was able to expose Miltank's body and zap it with a Thunderbolt, defeating Miltank and Whitney.