Evolving HN cards

Hello,
i have a couple of hn card  pairs.
Is it true you can make them evolve when they are max level ? i dont want to waste cards ans gold tout test
thanks

Nope. They can't be evolved. http://www.spiritstones.info/?page=evolution this should be useful to see all the evolutions available atm.

Is it best to use them to enchant other cards once you have enough better cards then?

Yup, definitely. Just don't enchant or evolve any card you get to fill the collection yet! Use the link I posted before, to see what you want to keep, and focus on enchanting and evolving with carry-on stats, only those. Anything else will come on it's own eventually, so don't waste your gold yet! And Seriously, after a while you'll be using rare cards as enchanting material too, so don't think much about the HN cards!