I checked on Wowhead and googled it and all I can find out is that it’s a weekly quest called Ecological Succession but it doesn’t say who gives the quest or where it is. I’ve searched everywhere. All I can find is the phase diving one. Is this not in game yet maybe? Does anyone know?
Probably gated behind the storyline and our stupid cloak. But that’s just a guess.
Locked behind chapter 4/5. That means it’s not available until next week, despite promotional materials indicating it would be available this week.
I wouldn’t worry too much, even if it is frustrating. All 12 pets from the cache are cageable, so you’ll be able to buy them all relatively quickly.