this is for Adobe Sketch iPad app
Trevor, Photoshop Sketch is a different app from Illustrator Draw.
As far as I know, there is no smoothing in Sketch.
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I'm not sure what Procreate's streamline option does, but you can make some adjustments to brushes in the Brush Settings panel.
Take a look and see if it has what you need. Here's how to get to it: Tap on any brush in the toolset then tapping the Settings (three sliders) icon at the bottom of the Color menu. That will open the Brush Settings panel.
Let me know if it's what you need. And if you can give me a bit more detail about what Procreate's streamline option does, that would also be helpful.