Welcome and be prepared to learn about the best Garen. Zombie Garen!!!!!
The idea of this is that Garen is annoying to kill in general. Now imagine if you just got done killing an enemy garen and you are about to go attack the rest of the team then BAM!!!!!
He's Back. Scary thought right. BUT YOU MUST REMEMBER with this guide dont use revive if you die in lanning phase(you must be pretty bad to die in lanning phase but still). Only use Revive when in a team fight and you have died.
The final thing is
1. They focus you and you come back to life and backin the fight in less then 2.5 sec = WIN
2.They try to focus someone else and die because of your constant damage and disruptes = WIN

This is standard Garen Build. Start dorans shield to sync with your passive. Then go straight to build boots the warmogs.

Your Main Focus is to stay alive and be annoying to the enemy for as long as possible, and what is the best way to do that but to go full defense tree. Going 30 Def allows you to tower dive and use your ult to finish off enemys without worrying about your health. Increases your health, and Health Regn.

Pros
1.Tanky
2.Great harass with your q
3.Is almost unstoppable
4.Can almost never be pushed out of lane, because of Health REGN.

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Cons
1. Ranged top lanners can stop your passive which can make Lanning pretty hard.
2. Lack of offensive summoner spells

http://www.youtube.com/watch?v=_4PWhrNJ_j8