Wasn't added to Valguero because aberration is still worth money. People dont need scorched earth for all the dinos anymore, but you need to buy aberration for all of its creatures. It won't be added to Valguero.
How to grow one without nameless venom: you use snow owl. Every time the rock drake gets low, just heal it with the snow owl. And if the torpor because of starvation gets too high, then feed it stimulants. 👍 good luck with your drake