Night

Night is a Gengar owned by a Team Rocket grunt. He was originally introduced in Chapter 4 of Stun as a Haunter named Necro. He originally portrayed himself as a friend by helping Stun and Star when they were suffering from dehydration at the hand of Groudon, but after Stun left Star with him to train with legendary Pokémon, Necro revealed his true colors as a member of a Pokémon Gang with Loll, Skull, and Freeze.

He is the one responsible for handing Star over to Loll, resulting in Berry's mutation.

Some time between the events of Stun and Stun II, Necro was captured by a Team Rocket grunt, was named Night, and evolved into a Gengar. He was one of the first foreign Pokémon to attack Eevee Island. Along with Night, the Team Rocket grunt who had captured him also was shown to have a Muk named Sludge on his team.

Night has not been seen since he was frozen and thrown into a raging river during Stun II.