Recently I've started playing with Wukong and I love him! What I like about him is that he is much bulkier than your enemies expect, he has a lot of natural health, armor and magic resistance. I found an item build that goes really well with him. The masteries, runes and spells can be adjusted by personal preference, this is just what suits my style and what works best for me. So in this guide don't focus on that, focus on the items.

These are the only ones I would recommend for Dominion.

In early game you need damage, armor pen and CDR. The Brutalizer gives you all of that! So, grab one of those and take a Health Potion if you want. You will have an easy time killing enemy champions, so next time you're in the base you are sure to have Mercury's Treads. Those are crucial on Dominion for a good Wukong. After that buy a Phage and finish your Entropy. Your next item after that is Sanguine Blade, but I personaly rarely even manage to finish it by the end of the game, because it's really easy to win with him.
If the game drags on, build Atmog's with Warmog's first.

Start off with one point on your Crushing Blow and two points in your Nimbus Strike. Take Warrior Trickster on level 4 and max it last. Max Nimbus Strike first and Crushing Blow second. Of course you take Cyclone on 6, 11 and 16.
The reason why you max Nimbus Strike first rather than Crushing Blow is because it gets more damage per level-up (and can be powered up by items), but if you're a Wukong player, you already knew that.

With your Youmuu's Ghostblade + speed shrine, you will be able to get into teamfights from across the map really quickly, so you will always be there for your team. Make sure to use your ult well in teamfights. Wukong's job is to distract enemies while the teammates capture points, and because he is bulky AND has high damage, he can withstand enemy attacks for a while.

To sum it up: Wukong is a beast in Dominion. If played properly, you should win at least 90% of your matches. Try the build out, come back and leave feedback (and suggestions for improvement), and if you like it, thumb it up.
With this build, I GAREN-tee success! (I just used a Garen pun in Wukong guide, deal with it :P)

Thanks for reading, and good luck owning!