Q.Roses Leaves Brown and Wilting
My roses were doing quite well until the last couple of weeks. They are ‘Geminis’ and are potted in a huge pot. The last few weeks it has rained nearly every day and the soil in the pot is a little moist. The leaves have started to brown and wilt and the whole plant looks like it’s dying. The stems and canes are still green; however, at the end of the canes where there were buds that have bloomed and fallen off, are brown and some have turned black. Due to this, we moved the pot out of the rain the other day until it stops raining, but I don’t know if the plant is salvageable. Any advice?

Roses are tough, don't give up. Sounds like you are dealing with an infestation of either aphids or thrips. Insecticidal soap should take care of that problem. This article may be of help to you as well:
https://www.gardeningknowhow.com/ornamental/flowers/roses/aphids-on-roses.htm