In D&D 4th edition, the PC of
- class Assassin gets training in Stealth,
- race Shade gets training in Stealth (Heroes of Shadow, page 121, "Practiced Sneak: You have training in Stealth.").
I checked the core rules, but could not find anything, (although I did not read everything) and I looked up answers on this forum and found an answer related to D&D 5th edition.
How do overlapping trained skills work for the D&D 4th edition?