Smite: Smite is a given for jungling as it's 100% necessary to have. By getting chilling smite, it helps early game not only for sustain in fights but is also a great choice to use on an enemy champion if they are low but may get away.

Flash: Most champions take smite as an ability, but in this case it can help evelynn get away from a nasty situation even if her W wasn't enough. However, you can experiment with other abilities instead of flash since her W dose make a good escape.

While these items are a good general build too follow, every team comp is different and will change your build. Things like Lich Bane is a core times you always have but make sure to develop the ability to know what to build off the fly depending on how the game goes.

Passive: Use evelynn's passive to your advantage. It's extremely useful for ganks since when its activated you can't be detected by wards, only be control wards. If the enemy has pushed into a lane you can easily go around and come out from behind for a successful gank.

(Q) Hate Spike: This is your most useful ability besides your ult. It makes clearing raptors much easier and also heightens your ability at ganking. Since it's cooldown is extremely low and it costs little mana so it can easily be spammed during a gank and can sometimes get the last hit when the enemy champion runs under their turret.

(W) Dark Frenzy: This is the last ability you want to max out. It can't do dmg but it's very useful for either getting out of a sticky situation or for running too your teammate when they're ion trouble. It can also be used to get to other objectives quicker or chasing down an enemy champion.

(E) Ravage: This ability is very useful in ganks since it does two hits an increases your attack speed for the next 3 seconds. It does quite the damage and can take a good chunk if ho from a monster which helps your clearing speed.

(R - Ult)Agony's Embrace: This ability can help start a team fight and while it doesn't do the most damage sometimes it's most useful when the enemy team is clumped all together since it';; hit all of them slowing them down.