Masteries are new and improved
For masteries I went 22/8/0. The standard attack magic masteries plus Havoc, spellsword, and Summoner's Wrath added in. The reason once again why the attack masteries are higher up is due to the fact that this is not a support build, and you want to deal the most damage possible. The eight points in defense allow for you to be much tankier due to the fact that Lulu is a naturally squishy champion. The health regen and magic resist really helps for your midlane game.
Lulu, Y U NO build support?
Before you go off, as most people do telling me how wrong the build is I want you to try it for yourself even if its just in a bot match, after that feel free to tell me how you felt, as I said before I am open to suggestion just remember for this build we are not trying to build her as a support. The thing I'm learning about that build is that it is similar to a heavy AP champion build. You start out with a boot of speed and pots as it makes your early skill shot dodge much more powerful. I next build into a Kage's Lucky Pick, this is kind of a guilty pleasure of mine some people don't like it but the added gold really helps build into Lulu's more expensive items. Buy your tier two boots next, depending on how the game is going or how you are playing Lulu, it will change which boots you should get, you could get Sorcerer's Shoes or Ninja Tabi but I seem to have found that the Mercury's Treads work the best. Next you start to build into the item that all tanky Lulus, even the support one's should have, Rod of Ages. This item on Lulu gives her ability power, health, and mana making it a perfect item for her no matter how you are playing. Next in order to make her more tanky you buy Rylai's Crystal Scepter, with that and Rod of Ages you are tanky enough to survive almost all ganks and still put out a ton of damage. Rabadon's Deathcap is a MUST for all ability power champs and with it you can deal massive damage with Glitterlance and Help, Pix!. The next two items, Liandry's Torment, and Morellonomicon, are there to play around with as in most games you will not even have time to get those items.If you want to you can also upgrade your boots again to whatever you prefer. It is all situational or if you have a preference. Very very rarely will you have the chance to build them all and by that point you will be so fed or farmed that it wouldn't matter. I have tried all of the items with her and although I only ever got them all a few times they all seem to work well no matter what order you build them in. If you think another item would work better comment and I will test it to see how it works.
With great powers comes great responsibility
This has been a topic of debate recently on which skills to max first and which to leave. For this Glitterlance should be maxed first, followed by Help, Pix!, then Whimsy. However in order for this to work you have to be able to hit with your powered up Glitterlance.
[*] If you are having trouble landing a Glitterlance you should use Help, Pix! to attach Pix to the enemy champ and Glitterlance while attached to the person you want to hit, allowing for an easy point blank hit. Glitterlance gives you a great early game harass with the slow and the mass amount of damage it can do.
[*] Whimsy is one of the more fun abilities, with the different ways you can use it. Being able to transform an ulting enemy champion into a cat is not only fun but also extremely effective, in that it helps your teammates or you kill the enemy. If you are getting pushed you should try to save Whimsy for when they dive you, quickly Whimsy them after they hit you on tower and you will very easily slay them. Also when you cast it on yourself or another teammate it allows you to be sped up and raises your AP based off of its rank 20 at rank 1 increasing by 10 on each level up. In order to surprise your enemy and deal good damage, wait till they through a spell on the minions then whimsy yourself uping your speed and ap, run at them and quick thrown a Help, Pix! / Glitterlance combo to do a ton of damage.
[*] Help, Pix! is good for vision, assisting teammates with your shield, and just landing a burst of damage on the enemy. When you learn how to use it appropriately in can be a very good spell to have. If you attach Pix to the front of your minion line or on an enemy or enemy minion it doubles your range on Glitterlance allowing for a very strong harass ability by being able to fire Glitterlance from wherever pix is.
[*] Your ult, Wild Growth is one of the most fun in the game in that it can be cast on any champion who is being focused giving them the edge in any team fight. You want to use it on your main damage dealer or whoever is being focused in the team fight. It can really turn around any fight if played right. Her spells are a ton of fun and if played right can help to win any game.
[*] Your passive, Pix, Faerie Companion is fun but not as useful when not building AD or attack speed. But it does allow you to do more basic damage to champions, so if you have the opportunity to poke with it do it.