Pokemon All trainers must be at least 10 to train Pokemon. If a child under 10 "owns" a Pokemon, it is only permitted if it is registered as a "family pet". They, however, are permitted to accompany older trainers on their journeys, but they may not participate in battles, the league, or any other form of Pokemon Contest.

Yu-Gi-Oh Who cares what age kids playing the game are. Everyone in this world is going to summon Satan one day or another, let's go ahead and start them off early.