You can not get all the soul gems in the dark cove on skylanders.
GET soul gem and unlock the soul gems upgrade
you find the soul gem in darkwater cove but i dont know the exact place in the level
dark light krypt
petty soul gems, lesser soul gems, greater soul gems, grand soul gems
You can find them on any level but the are hidden. Like in Stonetown one is under a tent before go in the skull door way. (not a undead gate)
Dragons peak
You find it on Cadavourus Crypt
Black Soul Gems are the only soul gems that can trap the soul of an NPC, including all ten playable races, and NPC daedra such as Dremora, and Shivering Isles' Aureals and Mazken.
in the level empire of ice but you have to buy it
No. Soul Gems are used for enchanting and recharging magic items.
get empire of ice and start looking
In Skyrim, the Black Star is a reusable, black soul gem that can hold both black and white souls. It is obtained by completing the quest "The Black Star." Black soul gems can hold the souls of humanoid beings, while white soul gems can only hold the souls of animals and monsters.