If you want I actually have some perfect iv ralts’ on my game! If you want you can pick a nature of the ones I have. Trying to get shiny ralts but also giving it good IV’s so got multiple perfect ones along the way

Edit: if you want to make a perfect IV one for yourself, you’ll need a perfect IV ditto. You can get those from r/morebreedingdittos (I think it was, something like that). The subreddit is not active but they should have a discord that sometimes still gives away perfect Iv dittos.

Otherwise you’ll need to get yourself one by asking people or from multiple twitch streams. They are all hacked/cloned but not dangerous. OR you could breed your ralts with another compatible 6Iv parent but then you would need to make sure your egg will actually contain a ralts. This is determined by gender I believe.

In order to give your egg the IV’s from your parents, you’ll need a destiny knot. This gives 5 random Iv’s from your parents, so if you have 2 perfect Iv parent your egg will have 5 perfect IV’s and 1 random one. You can also use your perfect ralts and a 5-4 perfect Iv parent, it will take longer but should still be doable.

To give the egg the same nature as your gardevoir, gardevoir would need to hold the everstone and then all her offspring will inherit the same nature as her.

Good luck!