Agatha's Gengar - Pokemon Generations (2016)

A Gengar belonging to the Elite Four Trainer Agatha, Agatha's Genar was her signature Pokemon, trained by the elderly ghost master to be her most powerful creature. Agatha's love for both her Gengar and Pokemon battles led to its' Pokeball being attached to her walking cane.

 'The Challenger'

After Blue's Rhydon defeated her Arbok in battle, Agatha played her final monster, summoning Gengar to the field. The Gengar emerged as a shadow, before revealing it's true form and taunting Blue by sticking and waggling his tongue at him. Gengar grinned as it lept at Blue's Rhydon.

However Gengar was defeated by Blue, allowing him to compete against Lance.

Appearances: Trivia:
 * 1)  'The Challenger'
 * Upon Gengar being summoned to the field, it looked like a shadow with no physical form, living up to its name of the Shadow Pokemon, as well as the abilities and gaseous states of its descendants Gastly and Haunter.
 * Agatha and Gengar must have had a strong bond for her to chose his Pokeball as the one to use as the handle of her walking cane.
 * Due to Blue defeating Gengar off screen, it is unclear of its moves or which of Blue's Pokemon defeated it.
 * Agatha's Gengar plays an almost identical role in Pokemon Origins (2013), used by the ghost trainer to fight Red rather than Blue.