Hi, I'm Lokkilol, I've played Gragas since Season 3 and have played him in top and jungle in plat and diamond elo. He's recently gotten a couple buffs that make him really viable in the top lane and the jungle.

Passive: Gragas heals 6% of his maximum health upon using an ability. (8 second CD)

Q: Gragas throws out barrel that increases in damage the longer it is put out and pops after 2 seconds (Use for wave clear or poke)

W: Gragas takes less damage, and has an empowered attack that has AOE(area of effect) damage

E: Gragas slams forward (small knockup that can work with yasuo)stunning them for 1 second. Typically you can EQ (look at combo vid below) then w to deal tons of dmg.

R: Gragas throws an AOE casket that knocks people away from the casket (You can use it to knock people to you, to a barrel, or to a location that you plan on using your E to.

Generally for laning, if it is a ranged bully, you want to play safe and just farm until you have 6. But, if you are against a melee champ, you can use your e q auto attack to get phase rush and trade. In addition, you have very nice sustain, so once you get lots of mana from your items then you can sustain and scale.

In terms of items, there are so many options. Some people like to rush CDR (45%) by buying a kindlegem, Glacial shroud, and CDR boots. But, I feel like ROA is a very strong scaling item that really works well on Gragas, making you a strong AP Bruiser. I kept my items simple because there is honestly way too much situational building.

There's a lot of options for jungling with Gragas. I like to autoattack red/blue and then kite while pressing w to heal back the hp from the first hit.

On blue side, you can start red, chickens, wolves, blue, gromp, scuttle
or
Red>Blue>Gromp>Top/Mid Gank>Scuttle

On Red side, you can start blue, gromp, wolves, chickens, red, scuttle

or Blue>Gromp>Red>Top/Mid Gank> Scuttle

Why do I need to Gank?

Ganking will give you lane priority, meaning that a teammate can help you take scuttle against the enemy jungler

Panunu is a very good one trick Gragas who made a great vid of combos on Gragas. Play Video

If you found this guide helpful, consider checking out my twitch and following my twitch :) Very much appreciated! I also do coaching on fiverr.