Hi! i'm AverydrunkAhri and this is my Ahri guide which i found works the best for me.I hope this guide will be very useful for you all proud Ahri mains.

PROS

High mobility
Very good outplay potential
Very good roaming
Good waveclear

CONS
Bad lategame
CC reliant
Low mobility without ult
Squishy

Passive: Vastayan grace

If Ahri earns 2 spell hits against an enemy champion within a 1.5 second period, she gains 20% movement speed for 3 seconds. 9 Second static cooldown

Q:Orb of deception

Range: 880
Cooldown: 7 Cost: 65 / 70 / 75 / 80 / 85
Ahri throws out and pulls back her orb, dealing 40 / 65 / 90 / 115 / 140 (+35% of ability power) magic damage on the way out and 40 / 65 / 90 / 115 / 140 (+35% of ability power) true damage on the way back.

If Ahri earns 9 spell hits (max 3 per cast), she gains Essence Theft, causing her next Q cast that lands to restore 3 / 5 / 9 / 18 (at levels 1 / 6 / 11 / 16) health for each enemy hit.

This is Ahri's main harrasing tool. Try to get both parts to hit by staying at a long range or hitting the enemy with your charm.The true damage is a nice bonus and you can do a lot of damage if have some AP,especially if you use it in teamfight and hit multiple targets.

W: Foxfire
Range: 700
Cooldown: 9 / 8 / 7 / 6 / 5 Cost: 40
Ahri releases three fox-fires, which after a short delay lock on and attack nearby enemies (prioritizes champions), dealing 40 / 65 / 90 / 115 / 140 (+30% of ability power) magic damage. Additional fox-fires that hit the same target deal 30% damage, up to a maximum total damage of 64 / 104 / 144 / 184 / 224 (+48% of ability power).

Fox-Fire prioritizes any enemy champion affected by Charm's damage amp and the target Ahri most recently basic-attacked.

I avoid putting a point in this skill at lvl3 because the damage is very low at fist rank and instead i put a point at lvl4. At rank 1 and 2, Fox-Fire Fox-Fire's damage is negligible and has a long cooldown. At later ranks, the skil starts to do some meaningful damage.

E: Charm

Range: 975
Cooldown: 12 Cost: 70
Ahri blows a kiss that deals 60 / 90 / 120 / 150 / 180 (+40% of ability power) magic damage to an enemy and charms it, causing them to walk harmlessly towards her for 1.4 / 1.55 / 1.7 / 1.85 / 2 seconds.

When Charm damages a champion, Ahri's abilities deal 20% more damage to them for 5 seconds.

Charm is Ahri's only form of CC. Successfully landing charm is the key to success with Ahri as it makes your other skills do 20% more damage. It won't increase the damage of autos or damage from runes (electrocute, aery etc...). Ahri's reliability on her Charm is the reason she is hard to carry with at higher elo.
R:Spirit rush
Range: 880
Cooldown: 7 Cost: 65 / 70 / 75 / 80 / 85
Ahri throws out and pulls back her orb, dealing 40 / 65 / 90 / 115 / 140 (+35% of ability power) magic damage on the way out and 40 / 65 / 90 / 115 / 140 (+35% of ability power) true damage on the way back.

If Ahri earns 9 spell hits (max 3 per cast), she gains Essence Theft, causing her next Q cast that lands to restore 3 / 5 / 9 / 18 (at levels 1 / 6 / 11 / 16) health for each enemy hit.

Ahri's ult is what makes her very slippery and versatile. She can use it both defensively and offensively. She can use it to reposition and chase targets. She can also dash through walls.The damage is somewhat low unless you are very fed