for a first weapon either dorons blade or dorons ring will work. next i build hexttech revolver and bilgewater for that sustainability, and helps with early ganks with the extra 150 magic damage and slow for when you get targeted ganking. next comes malady for a more successful gank. Sheen for a little more power. max your hextech gunblade, than lich bane. boots can be added when ever you have money, i recommend boots of mobility for the fact the with the sustain, you can farm extremely fast. lastly building rylai's crystal scepter gives you the extra slow even if you dont have time to get red buff. than either rabadon's deathcap OR zhonya's hourglass if you are being focused a lot, which you will. i find this maximizes the speed, and sustain for jungling, adding Teemo's blind, dot, speed, and nuke shrooms everywhere, not only can you teleport nearly anywhere on the map, but you can also use them to farm jungle faster.

So i know that Teemo isn't the most sought out jungle, but i never really understod why, i mean he is one of the fastest moving characters in the game, and he has a natural ability to stop attacks and run if he has too. so i made this build, hoping people will see the potential of a fast, easy to hide, gank, and counter jungle without getting caught, jungle. I know i dont add much info to my builds but thats because i dont really know what to add.

Using all attack speed, and 3 quints of movement speed, it buff Teemo up enough at start game to jungle successfully. also it grants a huge amount of damage per second for early ganks.

for the masteries i also focused movement speed while adding a bit of magic pen. allowing for faster jungling early game. I will admit the masteries doesn't add much sustainability but i find its enough.

like most of the other areas of this build the skills are also based on moving quick and doing lots of damage, however you can max out blinding shot rather than poison dart giving you a early nuke instead of more damage per second .

the summoner spells give you the power to jungle with smite, and go anywhere anytime with teleport, so long as you maximize the potential with your shrooms and wards, since you can teleport to them(saves time if you need to get blue fast and yout at red).

The path i usually take(without all runes) is golems, base, wolves, wraiths, golems(if enough health), base, blue, wolves, wraiths, golems, gank(base than red), than keep going, golem, red, wraiths, wolves, blue, gank, gank. but always shroom when you have 2, try and save one for ganking. when ganking try and run behind them and shroom the best path for them to get out(making them hit the shroom or walk around it giving more time) than focus the weaker champ, *BUT blind the chamo that does damage*.