I'm actually interested to see the new Fairy Type in action, Gardevoir is one of my go to Pokemon so if they have wild Ralts in the game I'll have a chance to try it for myself.
I've heard the argument that it makes no sense for a fairy to have an advantage against a dragon since it's basically just a magic bug. What those people don't realize is that there's more to fairy archetypes then just Tinker Bell and Navi, it can also be a term used to describe a sorceress, which I think is why they made Gardevoir of all Pokemon part Fairy. Case and point, Morgan le Fay, she's described as a powerful sorceress and her name in French literally means "Morgan the Fairy".
I don't understand why people hate on Gen 4, it did so much right and I miss the days when it was all the rage. Hell, I even consider the DP saga of the anime to be one of the better sagas in the whole anime series, except for how they gave that Pokemon Hunter a....GOD DAMN STAR WARS CARBONITE GUN!!!!