Pretty savage team IMO, though if it were me I would change a few things:
1) Like pretty much everyone has told you, Gardevoir > Gothitelle 8.5/10 times
2) I, personally, don't like donphan too much. I understand that it has sturdy, but I feel as if it's overall movepool, and generally reliability in the upcoming battles, will be lacking (at least, to an extent). I personally would change this to a Magnezone; magnezone has a better movepool, steel typing, and also has access to sturdy, which, when paired with mirror coat, allows it to revenge kill a lot of stuff.
3) Assuming you follow my advice about donphan, that would leave you with 2 electric types. I would switch out the emolga for a type that has STAB super-effectiveness on anything your team has trouble against. If it's nothing, then I would switch it too either a Honchcrow (because mafia hype) or to Staraptor, because staraptor has a beautiful movepool and a ridiculous attack stat.
But yeah man, either way, pretty savage team!