Reishi

Lacy is a character of the day who appeared in The Problem with Paras. She is Cassandra's grandmother.

The grandmother was first seen grinding herbs at the herbal shop. When Ash and his friends requested to buy some Potions and Antidotes, she offered them snake root that cures insomnia and grow hair on the nose and tongue. She was then scolded by her granddaughter, Cassandra. She told Ash that in order to control Charmeleon, he had to gain its respect by earning more Badges. She was last seen having found a Persian to be the company mascot, after Cassandra rejected Meowth.

(Source: Bulbapedia)