From Bulbapedia, the community-driven Pokémon encyclopedia.
Sabrina's father (Japanese: ナツメの父親 Natsume's father) is a character who appeared in two episodes of the Pokémon anime. Due to the fact that he was never given a name, this page will simply refer to him as Sabrina's father.
He first appeared in Abra and the Psychic Showdown. He recommended that Ash should not battle Sabrina, the Saffron City Gym Leader. After Ash was defeated by her, her father returned and told Ash the only way to defeat Sabrina is by using a Ghost-type Pokémon from Lavender Town. The man told Ash this after Ash had shown his tenacity, even after being thrown back twice and held down by telekinetic powers.
He returned in Haunter versus Kadabra to save Ash from being turned into a doll by Sabrina. Her father told Ash that Sabrina was not always as mysterious and manipulating as she is now. Ash returned to the Gym, and using his Haunter, he was able to earn his Marsh Badge by making Sabrina laugh again and therefore became herself again like she had in the past.
Although it is revealed that the man is Sabrina's father, Ash was not able to figure out their relation. He believed that the man knew so much about Sabrina because he was her photographer, while in the Japanese version Ash believed that he is a neighbor of Sabrina's. This really annoyed him, as his clues about being Sabrina's father are obvious.
He is also shown to be capable of teleporting without the use of a known Pokémon, as well as being able to teleport others with him. He also displayed telekinesis by controlling Ash's body and throwing him back without touching him.