From Bulbapedia, the community-driven Pokémon encyclopedia.
Nathaniel (Japanese: ナユタ Nayuta) is a character of the day who appeared in Strategy Begins At Home!. He is a small boy who lives in Twinleaf Town.
Nathaniel dreamt of becoming a Pokémon Trainer when he became older. Ash met Nathaniel when he saw him observing some wild Pokémon, and he reminded him of himself when he was younger.
Nathaniel's favorite type of Pokémon are Bug-types, and he hopes to catch many of them once he becomes a Trainer. After the Honey Nathaniel planted on a tree attracted a wild Heracross, Ash mentioned to him that he caught his own Heracross.