Continuity mistake: After the Pokémon are blown away, the front of Ash's hat changes from white to red. (00:46:03)
Continuity mistake: When Ash says it would be nice to go to Arborville, Pikachu's right foot is not past the railings on the riverboat, but in the next shot, it is. (00:14:17)
Continuity mistake: When the Iron-Masked Marauder hears that the man he has will tell him where Celebi is, the man's left hand changes position in accordance to the Iron-Masked Marauder's left leg. (00:09:59)
Continuity mistake: When Sam is told to hand over Celebi, the person who tells him has his right hand one centimetre away from the edge of the right handlebar, but in the next shot, it is two centimetres away. (00:06:37)
Continuity mistake: When Sam notices Houndoom coming, his right hand is at chest height, but in the next shot, it is at his right leg. Also, he holds his sketchbook at an angle, but in the next shot, he holds it straight. (00:05:57)
Continuity mistake: In the recap of the shot where Ash puts on his right glove, he puts it on differently in the movie than in the episode where this takes place. Also, the shot on the television set is an upward-looking corner view, but in the episode, it is a straight-looking side view. Additionally, Gengar is moving, but it was not in the episode. Furthermore, the controls for the volume and another one do have symbols, but in the episode, they did not. Moreover, a curtain is draped over the right side of a window with Ash not having it behind him, but in the episode, the curtain was not draped over there with Ash having it behind him. (00:01:34)
Continuity mistake: When Ash and friends are surprised when they see blue light and a shrine, Ash's right hand is past his left, but in the next shot, it is the other way around. (00:19:04)
Continuity mistake: When Ash says, "Hey, it's a kid," Sam has his right foot over his left one, but in the next shot, it is on the ground. Also, Brock's left foot is on stone, but in the next shot, it is on moss. (00:19:22)
Continuity mistake: When Professor Oak turns one page in a book, his left thumb is four centimetres away from the top of the book, but in the next shot, it is eight centimetres away. (00:15:32)
Continuity mistake: When Mr. White says that Ash and friends appear to like Pokémon, his right arm is by his side, but in the next shot, it is raised to chest height. (00:14:07)
Continuity mistake: When the Iron-Masked Marauder is in a caravan and wants to know where Celebi is, a picture of a lake disappears. (00:08:23)
Continuity mistake: When Sam is confused after Ash asks who he is, the trees behind him change between shots. Also, Misty goes from being near him to being absent. (00:20:06)
Continuity mistake: When Towa tells Ash and friends to stay where they are, the amount of space between each rung on a ladder is 15 centimetres, but in the next shot, it is 7.5 centimetres. (00:17:33)
Continuity mistake: When Ash and friends are first surprised that Mr. White's boat could fly, Misty's bag is closer to Ash, but in the next shot, it is closer to her. Also, Brock's hands are on the side of his seat, but in the next shot, they are on top of it. In addition, Misty's left hand is on her and Ash's seat, but in the next shot, it is not. Furthermore, Misty is next to Ash, but in the next shot, she is not. (00:16:33)
Continuity mistake: When a woman watering her plants notices the match below, the left shutter is open less between shots. (00:12:09)
Continuity mistake: When Ash says that his name is Ash and that he can be a Pokémon Trainer too, a house has an awning with six red strips and five white ones, but in the next shot, it has three of each type. Also, the awning's window has its interior framing coloured white, but in the next shot, it is brown. Additionally, the house's balcony goes past the window and has panes of glass, but in the next shot, it is between it and has no panes. (00:11:23)
Continuity mistake: When Sam is surprised by what he sees after he first stops running, his bag's right strap is not beside his collar, but in the next shot, it is. (00:06:08)
Continuity mistake: When Sam thanks Towa for her gift, the rock to the right of Towa and the tree to the left of it are there, but in the next shot, they disappear. (00:04:30)
Continuity mistake: When first showing the parting gift, Towa's left thumb is in between the top and the bottom of it, but in the next shot, it is at the top. (00:04:21)
Continuity mistake: When Towa tells Sam to wait, the rock closest to the left of her and the rope on change design, and the trees behind them go from being present to being absent. (00:04:13)
Answer: Missingno is a glitch from the video games, and is not a real pokemon, so no.
MasterOfAll