This is my very first guide so please don`t be critic too much. (And sorry for my English).

I play Vi for a long time, and I love her!
I often play Vi on Jungle, so I thought I can make a guide. Hope you enjoy.

In my opinion Vi needs armor, so she can be pretty nice tank in early game teamfights. I also gave her some damage so she can jungle easier, and she doesn`t need help at blue buff.

With this runes, Vi can make powerfull ganks on early game.

Those masteries make Vi a good tank and give her some additional damage. In my opinion it`s very important for her, so she can start teamfights, and kill the enemies with autoattack.

I don`t have to say much. Those items make Vi UNSTOPPABLE. She`s very good tank and she has nice damage. She also slows enemies - Frozen Mallet. It is important to buy Frozen Mallet and Warmog`s Armor as fast as it is possible. Then she is very important in teamfights, and enemies should be afraid of her.

For the first skill I`ve chosen "Denting Blows". It is very good for jungle, and then for Late Game fights. Then I pick "Excessive Force" and make it level 2, so it deals nice damage. As the last skill is "Vault Breaker" - I only use it for chasing people and ganking.
Her Ultimate can be also used to chase people, but I prefer to start teamfights with it.

Pros:
- Ganks
- Teamfights
- Health and Armor
- Not Bad Damage...

Cons:
- But not very good Damage

First kill Wolves, then go on Blue Buff. Then kill other monsters (without Red Buff). Make a Recall. Then make Red Buff, and done! You have both of buffs, now you can start ganks and you will jungle easily.