Why not using atk speed glyphs instead of magic resist? You already got 55 m-resi points due to your boots and Visage? The glyphs attack speed (5,76%) would be added to the frenzy passive harassments and get you your 3hits faster.

Wouldn't changing the armor seals for Greater seals of endurance (gives you 4.5% Health Bonus which is a lot with your current build, considering you get arround 4k health...that would give you arround 180 extra health points....) be a better boost?

Edit: also noticed you have teleport as skill and no cooldown reduction on your def masteries tree...
Wouldn't it be much better to put a Exhaust or flash there?

Exhaust can easily remove tons of damage from a nuker, saving a possible target in your team, also slow them and give you a gap to pull another target and then ulting. Killing two at a time.)

Putting flash instead of exhaust is a harder yet wise choice aswell... The flash would assure you your run from a gank or a powerful chanelling ultimate cancel.

And what about cooldown reduction? You just said yourself that cooldown redu suits any champion nicely, so why not have it from the start?

Great build, works well for pub-stomps

Nice build, your items and masteries are very similar to my build, but I take different runes, focusing on AS and health. Nice explanations.

edit: BTW, I like the build name :) It really is a pokemon name....I think Riot could have done better here.

It's a bear. ITS A GOD DAM BEAR. WE'RE ALL SCREWED.

Since Frenzy's bite is your main form of damage and your finishing blow, I'd have to disagree.

btw its thunder punch.... not fang, he's even using his paws.... comon man learn your pokemon references