Yup.
This is a guide.

Just go Ad runes. You dont need tank runes during Lane Phase. If you want to counter someone or meeting a heavy damage dealer then go tank runes.

Explanation above.

Mostly DPS. Of course you have to adapt build for game. But keep in mind Attack speed is the most viable because of his passive: Fury of the Dragonborn. Which make her Basic Attack bonuses on her abilities.

Alternative:

Warmog'g armor

Sure great item to AD offtanks together with Atmas. But i fell like Frozen mallet is better for shyvana because of the on-hit slow and damage.

Frozen heart

Indeed good if they have a fed ad carry or many AD Champions.

BUT: 500 mana isnt going to effect much.

Thormail.

Yes. I love this item cause it makes AD carries rage. But its not very much reason against some ad carries keep that in mind.

Wit's End

A good item on many bruisers including Shyvana. The atk speed together with MR makes it a viable option against fed mages.
But you really gotta get in and relay on not getting killed for this item to work. If you got a better tank like Rammus then this item is almost perfect. Wanted that explained.

Aegis of the Legion

A not very viable item to Shyvana Maybe if shes jungling and if the support is trolling. ;P

Blade of the Ruined King

Bonetooth Necklace

(-.-')

Force of Nature

Nice Magic Resist and Health Reg. I think its gonna get changed if S3.

Infinity Edge

Dont really need so much DPS if you got 2 carries. But still if you get fed you can get it.

Ionic Spark

A good item indeed but i dont like how little it gives i mean a trinity force give much stats for 1 inventory place... Think about that.

Last Whisper

A good item i like it if they get much armor and you want much DPS.

No. Dont. Please. I beg you.

Coming soon... I jsut want to eat now.