It's appropriate for all ages, but most adults would probably not take as much of an interest in it as kids.
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Pokemon
If you show Bill's dad a certain pokemon he will give you a evolution stone. He will totally give you a thunderstone. The last pokemon you show him is pichu, but after that you don't show him a pokemon forever.
Pokemon diamond & pearl
After Lickitung, you receive the stone appropriate to evolve each Pokemon you show him.
Pokemon is for the Nintendo game family