Is there a pen for the 6th generation I Pad

If you have a 2018, 6th gen iPad, then you need to purchase the original, 1st gen Apple Pencil with the silver, chromed, metalised cap/band near the top of the Pencil.

Best of Luck to You!`

Yes, the Apple Pencil 1st generation will work with your iPad. Apple Pencil - Apple.