Twinkle is a "thin root" Oncidium, so it will require regular watering. My experience is that they "sulk" when repotted. They also like to be pot bound, so use the smallest possible pot. I would not repot until the media starts to break down or the plant outgrows its pot. And only repot when new growth is evident as this will help the plant reestablish itself in the new media in the shortest possible time.