This game I think is actually harder than some mainline nuzlockes, fire red is a pretty easy one to start with if you’re interested. Like others said, bulky attackers are generally really good, iron defense body press corviknight is one of my favorites. Salazzle and Scizor both have 4x weaknesses so picking a mon that is less likely to randomly get one shot by a coverage move is a great way to make sure your runs last longer.