Can you use Dusk Stone to evolve directly from Litwick to Chandelure, or from Honedge directly to Aegislash?
No, because Chandelure & Aegislash (Stage 2) do not evolve from Litwick or Honedge (Basic); but you could use Dusk Stone to evolve them from Lampent or Doublade.
Source: TPCi Rules Team (2019-08-22)

Relevant cards

Note: All applicable cards may not be listed below.
SM10_167
SM10_167