i think you should switch the dodge runes for flat hp quints, and go dodge yellows.
just my opinion

Thanks for the build!!

It lacks a bit of MR sometimes, especialy ,when theres 4 casters(AP). One sunfire swap into banshee of Force of nature is good choise, imo.
Also, i pref. some ability reduction runes, instead of hp. Garen is pretty good at the early game only with his passive(i go 1v2, while jungler is off) with similar build, and its enough hp to survie at the turret until lv6(unless heavy pushers are at enemy side), and cooldown reduction is usefull for all the game(especialy garen) as well as garen will have a lot of hp through this build in late game, which means, that those 100hp from runes become more or less useless at late game, while cooldown reduction is still usefull.