>>13796336Adding to
>>13813197 's post.
An Uncertain Future by affTwill is another good Gardevoir story. It's a bit edgy and dark at times, and the author tries a bit too hard to show off certain plot points, but it's a quality read regardless.
There's a censored version on
Fanfiction.net http://www.fanfiction.net/s/8300602/1/An-Uncertain-Future, and an uncensored version on
adultfanfiction.net. I don't have a link to that one though.
Feyera's work are also of incredible quality. You'll be hard pressed to find another Gardevoir story of his quality.
Another option is Amazing Grace written by Write by Faith (that's the authorfag's name, not me being redundant). It goes an entirely different route from Feyera's and affTwill's approach. It's basically a slice-of-life, boy grows up with a Ralts story.
http://www.fanfiction.net/s/8232703/1/Amazing-GraceIt starts out a bit slow, but the author really fleshes out the characters and setting. He just finished the first story and promises part two is going to be more of an adventure and less slice-of-life stuff.
And if you want a good laugh, look up Sinners. Better yet, look up Sinner's encyclopediadramatica page. Gets me every fucking time.