Watching animes for fun

I am really confused.You might have heard of pokemon.I know that it is just a fictional story and just for entertainment.i know that we can do our entertainment until and unless it diverts us from worship of Allah.Some say that pokemon promotes gambling .I don't understand these all things.I mean it is just a fictional story and it does not even contain something really sexual.So pls tell me whether: 1.Watching pokemon is Haram 2.Playing pokemon is Haram Pls say me whether it is 'O.K','Not advisable ' or 'Haram' .Pls Explain