I saw there are a lot of topics about undervalued coins, but I did not find any about overvalued coins.

I hope everyone agree that there is no point to talk about some pumped crap. So let's only talk about coins that should have real value, but for some reason are overvalued right now.
As for me, I think the most overvalued coin today is Ethereum. I don't understand why does it cost so much. It is not decentralized. It is not limited, so there is no deficit. Nowadays it doesn't look innovative. It is not even great as a cryptocurrency. Of course it is great for ICOs, but most of the ICOs are crap.

Most of this coins will die in future. So it's just a hype and nothing more.

I am actually with you here. I know you will get a lot of people thinking you are saying the wrong things but this is precisely the reason why I stayed away from ETH for so long.
The reason I did buy a bit of ETH finally, luckily around the $600 range, is because I think this overvaluation will actually continue. And it might be overvalued for a very long time.
Centralized: people actually like this. If crypto people one day became as ideological as the original adopters, then maybe price will go down but we know this will not happen soon.
Inflationary: correct but the devs are fixing that.
Not a currency: correct but it never meant to be that primarily.