"Well, well. You're quite the adorable Trainer, but you've also got a spine. Ahaha! I'm Bertha. I have a preference for Ground-type Pokémon. Well, would you show this old lady how much you've learned?"
When last Pokémon is at critical health
"Dear child, don't assume for an instant that you've won."
Upon being defeated
"Well! Dear child, I must say, that was most impressive. Your Pokémon believed in you and did their best to earn you the win. Even though I've lost, I find myself with this silly grin!"
After being defeated
"You're quite something, youngster. I like how you and your Pokémon earned the win by working as one. That's what makes you so strong. Ahahaha! I think that you can go as far as you want."
"The Trainer in the next room is a much more formidable opponent. You really must have your wits about you. However, I think you can go as far as you desire. Ahahaha!"
Bertha has a strong advocacy for observant attitudes in everyday life and spent the entirety of the episode she appeared in to advise the group on their observation skills. For example, when she commented that Dawn should pay attention as well, since it would assist her in her Contests. Bertha views observation skills as useful tools not only in battles and Contests, but also in everyday life. She also prefers to keep her identity as one of Sinnoh's Elite Four a secret because she doesn't like the expectations attached to the title.
After Team Rocket was sent away, Ash and Bertha decided to battle. Hippowdon battled Ash's Torterra. Hippowdon often went underground and then attacked Torterra with a different move upon resurfacing. Despite this, Ash asked Torterra to sense Hippowdon when he was underground, managing to attack him with Leaf Storm. However, Hippowdon went underground once again and managed to attack Torterra a few more times, defeating it.
Bertha, along with Lucian and Aaron, appears during the Platinum chapter, having been enlisted by the Pokémon Association to decipher Charon's notebook that was stolen by Diamond's Kit. Together, they figure out the hidden information inside the book and give it to Diamond and Pearl so they can use it to stop Charon from capturing the Legendary Pokémon of Sinnoh.
Hippowdon is the only known Pokémon in Bertha's possession. Along with being used as transportation for Bertha, she was used to carry some books for her Trainer.
Bertha's Pokémon Cards listed with a blue background are only legal to use in the current Expanded format. Cards listed with a silver background are legal to use in both the current Standard and Expanded formats.