I’m a big time collector for all things. So that includes pets. I’m only missing about 30 pets in the entire game. 
One of those pets is Wriggle. Which only comes from Kobyss-themed Delves. That’s Tak-Rethan and The Sinkhole.
For the last two weeks or so, I’ve been trying to do 2-3 Tak-Rethan runs a day to farm the pet. I just finished everything in Undermine, so I thought I’d run one real quick.
Except the mobs are all bots now!
So… I’m assuming all the Delves changed theme for S2? Which means … there is currently no way to get the Wriggle pet? I’ll have to wait for S3, hoping it’ll come back around? I mean… maybe it won’t???
Sucks, I had not heard anything about this change. And I guess there is still a 1% chance that the pet is tied to the Delve, NOT NECESSARILY the mobs that are in it.
Does anyone know?
I would assume you could still get it since it only drops from the Heavy Trunk at the end? 
What u gonna do when you get those 30 pets ? Go after the new pets they always putting into the game ?
This is the answer to: does it need to be Bountiful or not? No-- it drops from the heavy trunk, which is the “basic” reward, not the Bountiful reward.
But I/we still don’t know if Kobyss mobs actually need to be in the Delve itself.
Delves have new variants that change… daily? Anyway, today’s goblins, it’ll go back to the usual stuff another time.
… of course.
And really, of those 30, I only have about 3-4 I can PRACTICALLY get. All those others are like pets from Blizzcon etc, which still show up in the “uncollected” list, but I have no realistic means of getting them.
On WoWhead there is a comment that says it doesn’t have to be.
I’m assuming it will stay like this for all of S2.
Guess I’ll know tomorrow/next week.
I… answered that. Why would you copy my quote, and not the answer RIGHT AFTER IT? lol
i didnt know there was anyone that collects the pets lol
It may not be quite as prestigious as collecting mounts, but it’s still very much a thing.
I mean… it’s Blizzard’s Pokemon. Gotta catch 'em all! 