The strangest fact about this category survives the restock: you still cannot find the Legion Go 2 named in a dock listing title.
Why that is not a no-fit. A dock talks to the machine over USB-C, and the Go 2's USB4 ports carry DisplayPort out, per Lenovo's own specification. The universal handheld docks that recite Steam Deck and ROG Ally are not physically wrong for this machine. They are unverified for it, which is a different thing, and this page only lists docks whose maker or whose owners actually say Go 2.
The open question we are not answering. Lenovo publishes that two ports are charging only. No Lenovo document we have read says what happens when a dock is attached to one, beyond the charging itself, and we have not tested it, because we do not test. The safe reading is the one above: video and data need the USB4 pair.
The docks we left out. Two verified in-stock docks, a Kstkry 6-in-1 and a 10-in-1 with a cooling fan and an M.2 slot, claim only the 2023 Legion Go by name, with no maker statement covering the Gen 2 that we could find. They stay off the list until someone who makes or owns them says otherwise, which is the standard everything on the list had to meet.
Other handhelds have their own dock questions: the ROG Xbox Ally X docks guide covers which docks ASUS and Xbox document for the ROG Xbox Ally X.