 If you liked
Pocket Monsters: PiPiPi★Adventure
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 ...then you might like
Youkai Watch
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Yo-Kai Watch and Magical Pokémon Journey are two kid-friendly manga series that are based off of popular Nintendo-associated game series centered around catching fantasy monsters. The main protagonist of both series is a human who befriends these creatures (including ghostly beings which is mainly the focus in Yo-Kai Watch) in many comedic and adventurous chapters. Both series share a similar sense of humor somewhat, though the former is more goofier and the latter is more cutesy.