I know the best area for it. A strike happen, about 3 secs later another happens, then about...7 secs later another happens, then 3 sec etc...
I go to where one of the cactuar stones is so i dont have to worry about moving or anything, just dodging, i just cant be half assed sitting there and doing it lol.
Tried the other night actually and got to about 20 3 times...lol