This is my first attempt at making a guide so if something isn't clear please comment. The point of this build is simple, DPS and SUPPORT THE TANK. While many Summoners choose to make Shyvana a DPS/Tank, this build focuses on supporting a tank with you acting as their source of damage. This build is very useful because many of the tanky champions have CC that Shyvana lacks, and Shyvana has the damage that some of those champions don't get without sacrificing some of their defense.

The Runes, Masteries, and Items that are used ensure that Shyvana will hit hard and fast. The Runes will give you the AS that is used for an aggressive early game, and allows you to farm and push relatively easily. The Masteries will give you a good damage bonus through the entire game. Combine that with the life steal from The Bloodthirster, the defense drop from The Black Cleaver, the slow from Randuin's Omen, and the 55% crit. and you are set for counter-pushing, or defending a lane if/when the time comes. Just beware of magic damage.

The ability sequence makes getting close to Shyvana a bad idea, so close the distance quickly and try to keep the enemy inside Burnout's range. the best case late game would be for you to be behind the enemy and use Dragon's Descent to carry them back into your team, follow that with Flame Breath to boost your damage, then use Burnout to keep up and Twin Bite to crit their life away. Most exchanges like this will end in a kill but remember to time your dives on enemies with high magic damage unless you want to become a casualty.

Pros:
1. High DPS and crit makes your auto-attacks and Q hit like a truck.
2. Very good at ganking and keeping your enemies in the fight.
3. AS and life steal help you get back in lane quickly.
4. Excelent at supporting anyone with CC.

Cons:
1. Low magic resist.
2. No natural CC.
3. Thornmail will HURT.