When Manaphy finally hatched, the first thing it saw was May and thus it thought of her as its mother, showing love and affection to her. Manaphy and May soon developed a very close bond even to the point that May treated it as her own child and Manaphy began learning words like "love" and "you", but their bond was affecting Manaphy's goal to find Samiya, so she tried to stay away from Manaphy but they eventually came back to one another and shared a tearful hug.
But sadly, it still had to return to Samiya. So after a tearful goodbye, Manaphy left but not before Manaphy shared one more hug with May and said "Love you Mama, Love you May."
Manaphy is the only Pokémon shown in the anime to use an attack before hatching from its egg.
Manaphy is the only anime Pokémon that was hatched from an egg that hatched in a movie rather than a normal episode, and the only one that is completely unrelated to Generation II Pokémon.
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For more information on this Pokémon's species, see Manaphy.