What is the best thing to outline a sketch with when you're going to use watercolour afterwards?
- Sharpie thick point
- Sharpie Fine point
- Regular black pen
- Black colour pencil
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As you gave sharpies as option, you seem to want see the drawing when finished with the water colour.
In that case, use whatever waterproof marker you happy to draw with, as the lines will be well visible, you need to draw in such a way that the lines are as you want them to be in the end result.
Pencil lines will work as well, if less obvious, as long as the pencil is waterproof, as most are.
On the other hand, if you want to lines to be almost invisible, a very light and thin pencil line or even pencil of which the lines will dissolve in water and disappear mostly or all in the paint you use later.
So from that you see it is a design decision.
Show or hide the lines, your choice.
Because watercolor layers are transparent and thin, any hard pencil marks will most likely be visible through the paint at the end.
THE "NICE" WAY
I recommend using your pencil lightly when you are creating your initial sketch/map and erase at least partially afterward, if possible.
I also recommend you using a 9H pencil or some "H" pencil, they're light and not noticeable.
THE "CHEAP" WAY
Get a pencil, use it lightly, don't make it too noticeable.
Hopes this helps! Good luck with your painting!