Arnold lives with his mother in Hophophop Town, a large city where the Pokémon Fan Club was using their Hypno and Drowzee to help their members get to sleep. The members of the Pokémon Fan Club were unaware that it was causing side effects with the children in the town including Arnold
. Arnold's Mother
was searching for Arnold
after he went missing and mistook Ash Ketchum
because according to her, Ash Ketchum
just looked like her son.
and his friends decided to help out Arnold's Mother
and try to find out where Arnold
had disappeared to. After Ash Ketchum
and his friends with the help of Officer Jenny
tracked down the kids to a park in the middle of Hophophop Town, Arnold's Mother
randomly showed up in the park and was reunited with her son.