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: In the recap, in Pikachu's Poké Ball's receiving, the tiles are larger in the movie than in the episode. (00:01:53)
Continuity mistake: When Towa says that Sam should not tell anyone about the Voice of the Forest if he hears about it, her right hand is on her apron, but in the next shot, it is on her robe. Also, the rock closest to the front of her has no crossing of ropes in front of her, but in the next shot, it has one. (00:03:41)
Continuity mistake: When Sam says that he has never heard about the Voice of the Forest, Towa's necklace is on a violet part of her robe, but in the next shot, it is not. (00:03:47)
Continuity mistake: When Sam asks, "Time travel?" Towa's necklace is not on a violet part of her robe, but in the next shot, it is. (00:03:52)
Continuity mistake: When Sam is amazed by the power of time travel, the trees behind him change between shots. (00:03:59)
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)
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 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 Celebi shakes on the ground, the flowers around it change between shots. (00:05:03)
Revealing mistake: In the shot where Celebi calls for help, its shadow disappears before it leaves the screen. (00:05:28)
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: 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)
Other mistake: When Celebi first heads over to Sam, the lower two segments of Scyther's thorax mistakenly have their colours swapped backward three times. (00:06:22)
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)
Other mistake: When the person who was asked why he would like Celebi gets a device from a bag after answering the question, his right hand clips through it. Also, his right-hand goes from being two centimetres away from the edge of the right handlebar to being one centimetre away. (00:06:42)
Continuity mistake: When Sam is crouching while his sketchbook is on the ground, the cracks on the rocks change between shots. (00:07:22)
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 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 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)
Answer: Missingno is a glitch from the video games, and is not a real pokemon, so no.
MasterOfAll