cheat SpawnDino "Blueprint'/Game/ScorchedEarth/Dinos/Wyvern/Wyvern_Character_BP_Poison.Wyvern_Character_BP_Poison'" 500 0 0 [level]
Naturally found in maps like Scorched Earth and Fjordur (Vanaheim). To narrow this down, I can help you with: poison-wyvern-spawn-command
to spawn them naturally, if that's what you prefer. Ark | How to Spawn a Poison Wyvern w/ Console commands poison-wyvern-spawn-command
Example (Level 150): cheat SpawnDino "Blueprint'/Game/ScorchedEarth/Dinos/Wyvern/Wyvern_Character_BP_Poison.Wyvern_Character_BP_Poison'" 500 0 0 150 poison-wyvern-spawn-command
If you want to raise a wyvern from a baby: cheat giveitem "Blueprint'/Game/PrimalEarth/Test/PrimalItemConsumable_Egg_Wyvern_Fertilized_Poison.PrimalItemConsumable_Egg_Wyvern_Fertilized_Poison'" 1 0 0 3. Detailed Features & Tips
cheat GMSummon "Wyvern_Character_BP_Poison_C" [level]
commands (e.g., to quickly get the required 100+ milk) Color customization commands for your new wyvern