As we all know, we always use the alistar to be a support champions who have attacks tendencies. But as I use it in rank game many times. I found Alistar is very good at use to be a gank champion. For this opinion, this time i will show this post about alistar gank guide in my blog: dema-cia.com. if you like, hope you can share this post to your friends. Or leave me your comment if you have different ideas. thanks.
Overview about Alistar:
Damage 55.03 (+3.62 / per level)
Health 442 (+102 / per level)
Mana 215 (+38 / per level)
Move Speed 300
Armor 14.5 (+3.5 / per level)
Spell Block 30 (+1.25 / per level)
Health Regen 7.25 (+0.85 / per level)
Mana Regen 6.45 (+0.45 / per level)
Abilities:
Q: Pulverize – Alistar smashes the ground, dealing damage to all nearby enemies and tossing them into the air. On landing, enemies are stunned.
Alistar smashes the ground, dealing 60/105/150/195/240 (+0.5) magic damage and tossing all nearby enemy units into the air, stunning them for 1.5 seconds.
The best control skill in League of legends, the ace skill for Alistar.
W: Headbutt – Alistar rams a target with his head, dealing damage and knocking the target back.
Alistar charges at an enemy and rams them, dealing 55/110/165/220/275 (+0.7) magic damage and stunning them while knocking them back.
W+Q, We only need proficiency in the use of this skill combinations.
E: Triumphant Roar – Alistar lets out a commanding war cry, restoring health to himself and nearby friendly units for half the amount. Can be cast more often if nearby enemies are dying.
Restores 60/90/120/150/180 (+0.2) health to Alistar and half as much to nearby allies. Cooldown is reduced by 2 seconds each time a nearby enemy unit dies.
As the fighting continued, treatment effect of the skill will be stronger.
R: Unbreakable Will – Alistar lets out a wild roar, gaining bonus damage, removing all crowd-control effects on himself, and reducing incoming physical and magical damage for the duration.
Removes disables from Alistar, and Alistar gains 60/75/90 Attack Damage and takes 50/60/70% reduced physical and magic damage for 7 seconds.
To absorb enemy control skills effect, using the skills can relieve the negative state.
Passive: Trample – Each time Alistar casts a spell, he Tramples nearby units for a few seconds, dealing damage to units he walks over.
This passive skills can make damage to the building.
Builds:
As a MT, I chose the 0 21 9 defensive build. At the late in the game, I tend to take on the task of human shields.
Runes:
Physical Armor + 9.8
ATK + 8.5
Movement speed + 4.5%
Attack Speed + 7.3%
The PA+9.8, ATK+8.5 and Attack Speed + 7.3% can make me MF the neutral monsters safely and faster. The Move speed is prepared to gank (with the Shurelya’s Reverie or Boots of Mobility items.)
Summoner skills:
+ 
Its dont need to say more about those too skills.
Item routes:
step1:
Step2:
Step3:
You can also choose the 
to instead the Force of Nature.