That's strange, Dictionary.com defines "evolution" as:
ev·o·lu·tion /ˌɛvəˈluʃən or, especially Brit., ˌivə-/
–noun
1. any process of formation or growth; development
Evolution goes against the teachings of the Lord, and I just don't know if I'm okay with my son being exposed to that.
Dictionary.com got to be the worse place for definitions -_-;
Really, have to understand the context of a word, along with its denotation and connotation... In this case, as everyone pointed out, is simply growth and change. Surely your son DOES GROW as well.
Evolution has many different meanings. Only one of the many is truly in conflict. I'm a Christian myself, and certainly see "potentials" where Pokemon is definitely dangerous... and it's not evolving. Ghost and Psychic Pokemon ought to be the most 'problematic' crew out there...
For Ghost and Psychic types, it'll just depends on how you treat the line for invention. There are parents who refuse to say, let their kids play with anything that got wizards and magic involved, because in real life they are certainly not acceptable. However, some people thinks that it's all part of imagination.
Personally, I think that if it doesn't hinder your faith or demote it, then it is fine to do so. If the concept of evolution in Pokemon, even after explanation, seems to be promoting ideas against the Bible, then best to separate from it under an understanding is reached. If it doesn't hinder the faith and an understanding that it's all part of someone's imagination to have these game mechanics/anime ideas, then it's just fine...
To me, it all depends on whether or not the person in question can think of them as "purely imagination only" or not.
Feel free to PM me about it if you question me or thinks that I'm wrong... I prefer to only talk of this matter through PM from now on, just because I am already not liking the atmosphere of this place to talk about this matter =/
(asking a Pokemon board if Pokemon is ok? totally not biased, yes *nods*)