I'd put Ralts a tier higher, not only because Gardevoir is amazing and totally worth the wait, but a lot of people forget or don't realize how useful teleport is. We don't have fly in-game and from what I've heard we won't have it for a very long time: hence, teleport is the next best thing, and you don't need any badges for it. It cuts down on travel time significantly if you use it wisely, so much so that I think it's totally worth a move slot, even on my Gardevoir, despite being useless in battle. Combine it with dig for an instant heal anywhere you want; never black out again and lose money and pride!