Update: I have just read in 2 places, the US forums and the Discord, that it requires only FIVE of the Larion Cubs to get a /pet at the same time.
Courage has been found!
By Deowulf (17,194 – 2·17·78) 2 hr 1 min ago (Patch 9.0.5)
Found!
Did this in Bastion at Nemea’s Retreat. There are 9 larion cubs in the area that can be pet. When all 9 are pet at the same time then Courage spawns next to Nemea. Simply right click Courage to have the pet added to your journal.
Credit to: Deowulf-Dragonblight, Ariennelenna-Dragonblight, Sita-Fenris.
and from the Discord:
Q: When it says 9 have to be pet at the same time, does that mean 9 players have to be present, or is there some leeway with timing?
A: The buff lasts 10sec, very little leeway since petting had a cast time too + moving between cubs
My personal note: the cubs were quite spread out when I did it with a group of 9 just now. You could not possibly have done it alone, or I think even with 3 people. However, one of my group said his Larion Cub was “bugged”, so maybe not all nine of us were needed. I don’t know.
See also
for further possible information coming in.