Professor Holly is a character from the Pokémon Trading Card Game Online. Holly and her husband own the Game Store where her daughter Ella works with Zach. Over the game's different iterations, she has usually been involved with the tutorial mode, teaching newcomers the basics of the Pokémon Trading Card Game. She appeared in the game's original tutorial mode, guiding players through 12 situations to reinforce their knowledge of the game's rules. These tutorials were eventually retired from the game itself but can still be found as a stand alone browser-based program on Pokémon.com. A separate set of Tutorial Modes was later re-implemented into the Pokémon Trading Card Game Online, without the professor's guiding presence. Finally, her role as tutorial guide was reinstated after another update to the tutorial system. She appears with an updated design and leads players through five partial matches, explaining their opponent's actions and suggesting counter-moves.
Professor Holly's initial tutorials were divided into three broad categories: Basic Skills, Intermediate Skills, and Advanced Skills.
Topics covered under Basic Skills included: Energy, Pokémon Evolutions, Trainer Cards Save the Day, and Battle!.
Topics covered under Intermediate Skills included: Weakness & Resistance, Retreating Your Pokémon, Prize Cards & Winning the Game, and You're on the Hot Seat.
Topics covered under Advanced Skills included: Pokémon Abilities, Intro to Special Conditions, Special Conditions in Action, and Setup & First Turn.
Many details about her were only clarified after her redesign such as her relation to Ella, position at the Game Store, and even her name. Since many official newsletters for the TCGO from before this time were signed by a "Professor Maven", some believed that to be her name.