Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Evelynn can be a really good champion, or she can be a feeder. I'll show you how to kick *** with her, I went 33-8-5 with this build
I pick Ghost and Teleport. I use Ghost because Boots of Mobility,
Malice and Spite, and Ghost will let you chase down anyone who is trying to run. It also can get you out of a gank really fast.
I use Teleport to get up to a tower or minion to help get a kill or push quickly. When you use Teleport put your screen where you want to teleport to, then use Shadow Walk real quick and teleport right after you use it so you go stealthed when you get there.
I don't own any Runes, so I don't know what to put on, you can do what ever you think is best for her, if you have some runes, put them in the comments and I'll add them for other people.
Sheen - I use this first for the extra mana and ability power.
Boots of Mobility - They give you really good speed for quick escapes and quick attacks.
Sunfire Cape - It gives you health, armor and, while around enemies, it does damage. Stealth + Sunfire Cape = Win.
Lich Bane - Extra mana, ability power, and magic resistance
Nashor's Tooth - Gives attack speed, mana regen, ability power, and 25% cooldown.
Deathfire Grasp - Ravage + Death Fire active = Win. And cooldown reduction by 15%, ability power, and mana regen
Trinity Force You can use this for the extra attack, mana, and attack speed, or you can use Mejai's Soulstealer for the extreme ability power.
In the beginning of the game, never EVER go mid. If I'm purple I go bottom because it's close to the golem buff for the extra mana later game. Try and get down there fast and run through the brush with your lane partner and try to find the enemy champions. When they get close to the brush your in, Spam Hate Spike, back out, go back, spam Q, back out. Use your health potion if you need to. Now just go for the minions so you can level up. When you get Shadow Walk don't use it, wait until you get Ravage. When you have that, go stealth, wait for a good time, get BEHIND your target do Ravage, and run away. You should not do this early game on Teemo or Twitch or fast champions that are strong or you will be screwed. Once you get Malice and Spite, use it right before you press E so you have faster attack. Also, while they are stunned and you are attacking, spam Q even while your chasing them.
In the middle of the game, you should be able to get the golem buff, and with the help of others, being able to take down enemies. Just keep doing what you've been doing.
In later game, you can start pushing on your own. You can pick a lane while others distract them and you can push push push. Save Malice and Spite for when you get right in front of a tower and just tear it down. Also spam Q to kill the minions so they don't kill your minions. If you see a gank coming, go stealth. If you didn't expect it and they have swarmed you, go stealth while Ghost or Malice and Spite so by the time they get close, your long gone and you can get to another lane or go get a solo champion.
Well that's how I use Evelynn, if you have any suggestions, why you liked it or didn't like it, please post it in the comments :D