I've been working on this and perfecting it for a while now, and it's time to reveal this exploit to you all.
Let's get to the point:
Here are the steps to making your account legendary, and being able to solo all of Ulduar Heroic:
1. Open WoW
2. Log in
3. Go to any server (doesn't matter, works on all servers)
4. Create a NEW CHARACTER (Must create a new character for this to work)
5. Pick a race that supports the paladin class
6. Choose the paladin class
7. Type in a name or randomize it (doesn't matter)
8. Create that character.
You now have an unstoppable killing machine. Go fourth and conquer!