Liam stayed at the Sprout Tower for many hours. Eventually ghost Pokemon started appearing. A ball of gas appeared. 
"[i]Gastly, the Gas Pokemon. Its body is made of gas. It is born from gases. Despite lacking any substance, it can envelop an opponent of any size and cause suffocation. Anyone would faint if engulfed by its gaseous and poisonous body.[/i]"
Liam noted that its appearance did not match the Pokedex, like his Lapras and Sherlock. He sent Cynder out to battle it. Cynder managed to burn the ghost. The Gastly used hypnosis and put Cynder to sleep. Liam threw a Pokeball and made a capture.