>>47240439"The Raging Goddess" is the title for the G-Max form; but the normal one earned the moniker "The Forest Witch" for a reason. It would absolutely maul the shit out of the Ralts for trying to constantly aggravate it's sensitivity.
Grass Types would be a good fit; most of them have the ability to calm those around them with aromas and pollens. Other good choices would be Impidimp's line since it quite literally sucks up emotions to feed on them, removing them in the process (and, as the sibling line for Hatenna anyways, the two would be beneficial to each other), Indeedees (especially F-Indeedee, which coincidentally is an extremely good partner for Hatterene in VGC as well), Oranguru, Drampa, Lucario (since it can see emotional states and is stoic itself, so it'd know exactly how to help take care of a Ralts and how to help calm one down), there's plenty of reasonable and good options out there.
Ralts is not one of them. Ralts would get killed.
This is like buying a very large dog to accompany a tiny dog that was there before. It never ends well.