Hello, my name is TenaciousE, and I'm going to convince you that Wukong is a great jungler :D

You don't often see wukong jungle, but that doesn't mean it's not good. Wukong is a great champion with high base damage and one of the best ultimates in the entire game. Jungle wukong is basically a malphite that can do obscene amounts of damage (espcially early game), and his stealth helps him be a strong ganker despite his lack of cc. You may not see what makes Wukong so special, but I implore you to try it out! You might be surprised!

See my item notes.

Start with machete and five pots. Then rush wriggles lantern and at least tier 1 boots. After wriggles, I usually get a brutalizer for early damage (unless I'm having trouble staying alive - then get a giant's belt) and then get a defensive item depending on the context of the game. I usually go with Warmog's, but Randuin's Omen, Locket of the Iron Solari, Aegis of the Legion, and Frozen Mallet are all good options. Wukong can be built many different ways, so you need to use your judgement to decide what your team needs from you. For damage, a black cleaver and frozen mallet are usually enough, but if you have the money to spare, getting a bloodthirster isn't a bad idea either. But never lose sight of your purpose! You are a jungler who doesn't have the gold income of a top laner, so build efficiently! That usually means tanky!

Also, buy lots and lots of wards so your laners won't die repeatedly to ganks and so you can counter gank. Every time I go to base, I usually buy at least one regular ward and a pink ward with which I will either ward a lane that needs to be ganked or ward an objective like baron or dragon. WARDS WIN GAMES.

My masteries aren't typical, and you might not like them, but they are defensively oriented and work well for early game jungling and late game durability. Feel free to try your own masteries if you don't like mine.

I use a pretty standard runeset for jungling. The AD quints are pretty essential for early clears and ganks, and armor pen marks make you hit harder than flat damage marks would.

Pros:

Great initiation/ultimate
ward hopping with stealth
good burst damage early game
people don't know how to play against him
fast clears
no mana problems after first blue
useful late game even if doing poorly
strong invades

Cons:

Lacks cc in early ganks
Can't fight the godly jungler duelists 1v1
low sustain in first clears

I typically start at wolves -> blue -> wraiths -> wolves -> gank OR wolves -> blue -> red -> gank, but you can do the traditional paths to get level 4 before ganking if you want to. Only go to red after blue if you got a smiteless blue.

Also, if you are jungling against a Lee Sin or Mundo or some other jungler who likes to invade your red, start there, ask for a smiteless, and then go straight to their blue. Especially if it's someone like lee sin, they will probably gank before going to blue, so it's a free blue for you :D

Wukong has some of the best initiation abilities in the game. Use your decoy or flash into the middle of the enemy team and use your ult for a great initiation. If you do this correctly, then their squishy carries will get scared and run away from you while your team follows up on your initiation. If their team doesn't scatter, just stick to their most fed carry, and you will probably get very close to killing him. If for some reason you are about to die, you can decoy out of the fight. Doing this will bait enemies into attacking you and allow you to leverage positioning for your allies.

Jungle Wukong works best as a tanky initiator, so if you build a lot of damage, you will probably die very quickly unless you have some other tank on your team who can initiate fights (singed, malphite, zac, amumu, ect.).