Stoneskin, phalanx, Genbu's shield, and all the chigoes you can handle.
If you want it leveled fast, use a strategy like Vx mentioned. MNK mobs are good targets because of the fast attack rate and low damage strikes. Start off with one at a time and as you get more comfortable tank 2 or 3.
Like others have mentioned, there's plenty of questing that will have you go somewhere and kill something so you could just skill up shield over time with less frustration.