If you're looking to add some symmetry to your Procreate drawings on your iPhone, there are a few different ways you can go about it.
One option is to use the Mirror tool. This will allow you to create a mirror image of your drawing, which you can then move and place next to the original. This is a great way to create symmetrical patterns or shapes.
Another option is to use the Transform tool. With this tool, you can select an object and then choose how you want it transformed - including flipping it horizontally or vertically. This is also a great way to create symmetrical patterns or shapes.
Finally, if you're just looking to draw something symmetrical from scratch, you can always use the Grid tool. This will overlay a grid on top of your canvas, which you can then use as a guide for drawing symmetrical shapes and patterns.