Katie makes medicines by using the electric powers of her Mareep. She runs a pharmacy with the help of her granddaughter, Mariah, and McCauley. McCauley always wanted to impress her and tried to make the medicine exactly like she does. However, she could not sell the medicine he made because it wasn't done right.
Katie demonstrated to Ash and his friends, who visited her shop, how she makes her potion. The special ingredient of the potion she made was dew taken from a Sunkern leaf. Later, when she caught McCauley trying to make medicine again, she explained to him that he needed to have more confidence in himself, as well as his Ampharos. Soon, the pharmacy got robbed by Team Rocket, who planned to sell Katie's medicine.
Katie asked Brock to shoot down Team Rocket's balloon with Marshtomp's Mud Shot. When he did, Team Rocket reflected it back, which hurt both Katie's Mareep and Ash's Pikachu. McCauley and Mariah then quickly whipped up a medicine to make Mareep and Pikachu feel better. After Team Rocket was eventually defeated, Katie realized that McCauley and Mariah had made a perfect potion without the use of dew from a Sunkern leaf. It was then that she felt confident enough in McCauley and Mariah to leave the pharmacy to them.
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| Katie uses her Mareep for her potion making at her pharmacy. After Team Rocket tried to take over the pharmacy with their mecha, Brock used his Marshtomp to attack them, but their reflectors redirected the attack to Mareep and Ash's Pikachu. A potion was then made to cure them and Mareep, along with the other Electric-type Pokémon, finished Team Rocket off.
Mareep's only known move is Thunder.
|Debut||A Chip Off The Old Brock|