Evolution! That Mystery and Wonder!! - S8-E50
Continuity mistake: When May says, "So there must be a town nearby!" she is behind Ash, but in the next shot, she disappears. (00:00:21)
Evolution! That Mystery and Wonder!! - S8-E50
Continuity mistake: When Dr. Gordon first demonstrates his Future Sight device, the utensils on it are grey, but in the next shot, they are brown. (00:02:36)
Island of Doctor Moroboshi! Fossil Pokémon Appear!! - S8-E10
Revealing mistake: When Armaldo leaves the laboratory, it clips through a wall. (00:12:13)
Evolution! That Mystery and Wonder!! - S8-E50
Revealing mistake: When Caterpie leaves the laboratory, it clips through it. (00:09:20)
Evolution! That Mystery and Wonder!! - S8-E50
Continuity mistake: When Dr. Gordon says that one of his experiments caused Caterpie to become large, Ash is behind a violet building, but in the next shot, he is behind an orange building and a violet one. Also, May is to the right of him, but in the next shot, she vanishes. (00:11:21)
Evolution! That Mystery and Wonder!! - S8-E50
Continuity mistake: When Caterpie emerges from the laboratory, Brock and Max have their bags, but in the next shot, they disappear. Also, May is behind Brock, but in the next shot, she is in front of him. Additionally, Dr. Gordon is in the back of the group, but in the next shot, he is in the front of it. (00:09:16)
Evolution! That Mystery and Wonder!! - S8-E50
Continuity mistake: When Caterpie goes to the source of the suspicious activity, it faces Zander, but in the next shot, it faces away from him. Also, Ash's marks go from being absent to being present. (00:05:41)
Evolution! That Mystery and Wonder!! - S8-E50
Continuity mistake: When two people stop on a bridge to watch Caterpie, the man with the blue jacket has his body facing away from Caterpie, but in the next shot, it faces towards it. (00:09:40)
Evolution! That Mystery and Wonder!! - S8-E50
Other mistake: When Ash and friends are first in the laboratory, Pikachu's right cheek pouch is missing. (00:03:13)
Evolution! That Mystery and Wonder!! - S8-E50
Continuity mistake: When May says, "Thanks, Dr. Gordon!" Dr. Gordon's left hand is at his left side, but in the next shot, it is behind him. (00:05:33)
Evolution! That Mystery and Wonder!! - S8-E50
Other mistake: When Max asks if Zander studies with Dr. Gordon, Pikachu's right cheek pouch is missing. (00:03:50)
Evolution! That Mystery and Wonder!! - S8-E50
Continuity mistake: When Dr. Gordon collapses after pulling the wagon, part of his hair goes from being present to being absent. (00:10:33)
Answer: He is a good guy but just found himself in a bad situation when he worked for Lysander. He didn't want him to harm Ash and his Pokémon when he was trying to get the special bond between Ash and his Greninja to work. He does leave Lysander and go back to being a good person.