 If you liked
Yu☆Gi☆Oh!
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 ...then you might like
Pokémon DP: Pocket Monsters Diamond Pearl Monogatari
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Pokémon DP Adventure and Yu-Gi-Oh are two action-adventure manga about a friendly and faithful young male protagonist who battles others with fantasy-themed creatures. The kind of humor and sense of battle/combat progression are very similar, especially when the fun cast of characters turn things around with surprise strategies. A very firm and heartfelt belief in the power of friendship and believing in one's companions are also major themes the two series have in common.