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 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 is crouching while his sketchbook is on the ground, the cracks on the rocks change between shots. (00:07:22)
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 is amazed by the power of time travel, the trees behind him change between shots. (00:03:59)
Continuity mistake: When Celebi shakes on the ground, the flowers around it change between shots. (00:05:03)
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: In the shot where they first visit the Lake of Life, Sam wades into the water (all the way up to his waist). As he steps out, there is only water at his ankles, and moments later, there is no water. (00:34:56)
Answer: Missingno is a glitch from the video games, and is not a real pokemon, so no.
MasterOfAll