As much about marketing as it is imagination.
Parents need to know that this series has very simplistic dialogue and themes and is part of a gigantic licensing juggernaut. The often cute-and-cuddly Pokemon monsters appeal to kids as young as 4 or 5, but the subject matter -- pitting monsters against each other using a multitude of attacks -- may not be appropriate for them. The battles the monsters participate in can get fairly violent, with laser blasts and explosions. Characters strive to battle honorably, respect their elders, and care for their monsters, which partly balances the show's violent premise. That said, the fact that the characters have pet-like subordinates that they summon to do battle on their behalf is a bit disturbing.