This is just a fun, simple build. I don't want to say much so please rate and comment. Hope you enjoy it!

Feel free to change things in the build to your own liking.

Anybody can play AD and do a decent job. Although, Galio has a few tricks up his sleeve to make him better than some other champions who play AD.

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Runic Skin gives him Ability power while he builds AD
+ This build still allows him to be the anti-caster champion
+ His ability Bulwark allows him to do even more damage

Greater Mark of Destruction- help him deal more both physical and magic damage

Greater Seal of Clarity- helps him spam his abilities a little more. More specifically, use his Resolute Smite for harrass and Bulwark for healing from minions and to reduce incoming damage

Glyph of Warding and Quintessence of Warding- Gives him Survivability and more Ability Power
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The Masteries I chose are for more damage overall and more mana.

You can also go 14/9/7
Offense Tree-Taking Armor and Magic penetration
Defense Tree-Magic Resist, Health Per Level
Utility Tree-Mana and mana regen

Mercury TreadsMercury Treads- Tenacity is always a good thing and you get magic resist.

Maw of Malmortius- Attack damage, A nice sheild for close battles, and MORE MAGIC RESIST!

Wit's End-The attack speed is good. The passive lets you do more damage and it gives EVEN MORE MAGIC RESIST!!

Aegis of the Legion-This item is a well-rounded item that not only helps you, but your teammates as well. Furthermore, not only do you get a tiny bit more damage, but you also get MORE MAGIC RESIST!!!

Zeke's HeraldZeke's Herald- This item can be good for your AD carry and yourself, for it gives lifesteal and attack speed.

Banshee's Veil-Although not my favorite item, this item is very good for Galio, it gives him everything he needs and as a bonus, a shield!

Frozen Heart- This item is a good item overall and gives good armor, mana, and Cooldown reduction. Oh and don't forget the nice attack speed debuff.
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OTHER ITEMS

Randuin's Omen- If you don't want Frozen Heart, this is a good alternative for it. Also, if you are having a bad early game, you can pick up an early Heart of Gold

Force of Nature- Good sustain and magic resist

Atma's Impaler- Gives a decent amount of damage and armor.

Resolute Smite- This ability gives a nice slow to catch up to your opponent to punch them in the face a few times. It also has a good base damage, so I max this ability first

Bulwark- Bulwark is a very good, versitile skill which can be used offensively or defensively. It allows you to tank damage and heal yourself depending on the situation. ALSO TAKE NOTE: Each tick of Damage over Time abilities will heal you; such as Ignite. This can also be used offensively because it will give you more magic resist. More magic resist=more ability power=more damage.

Righteous Gust- This is good for escaping and chasing foes.

Idol of Durand- This ability can be game breaking and should be timed well to get as many enemies inside of it. It can make the difference of winning a teamfight and losing one.

- this will help finish your opponents and stop them from healing to much.

- This ability will allow you to get in position for your ultimate. Or it can help you finish off opponents or run away.

you can also use...

I hope you enjoyed the build and remember, this is just for fun!

Depending on how well tihs build is rated will decide whether I go more in depth or not. Have fun!