Thunder Plains, Cactuar Stones

I know that to get Kimahri's Celestial weapon you have to activate 3 Cactuar Stones in the Thunder Plains. But what I want to know is, do you activate any random stone or are there 3 in particular, and if so where are they??? :confused:

Oh and while i'm in the Thunder Plains with the 200 Lightning bolts that you have to dodge for Lulu's sigil does it affect anything if you get a battle?

i) You can use any of the cactuar stones.

ii) Getting into a battle doesn't reset the counter, but it does make it more likely that you'll get hit. Use a No Encounters armour to reduce the interruptions.

Yeah, not to mention how much slower it is to dodge bolts if you're constantly interrupted by battles.

Thanks

it helps to not move i usually set up by the
cactuar stone in the L shaped gouge that you grap the waterball in