Originally Posted by KitStylus
Not to be a nay sayer but dont people normally get like only a couple of Pentakills in their lifetimes? Unless you mean in a beginner bot game, and still it would be really hard if you plan to do it on your own.
Depends on what champions you play most of the time, support and tank pentas are extremely uncommon, where ADC/Assassin/Bruiser pentas can come off like no one's buisness in certain cases.
Kill resets and very high mobility/burst make it a whole lot easier in general though, in that case I would recommend Katarina, Akali, Tristana, and Kha'Zix. Happy hunting, and remember that mass CC/range champs also do quite well, such as Varus/Lux/Karthus/Ashe.
Vayne is also good, just because if you can get to mid/late game in good shape you now have 3 steroids and all the items to support them along with high mobility and epic jukage.
That being said, my only pentas are on Ashe (first real game penta) Zyra (second, all in one ult, only our Taric was really there helping, but considering he baited them all, he helped a lot) and Vayne, just because late game ADCs with strong kiting/chasing do that.