the three lake Pokemon will tell you where to move them by which way they float
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Don't worry, just go back to the higher levels and the boulders will be there for you to push down again.
You will have to find the three Pokemon of the lakes, they at the places where you have to push the bolders. And this is important! Make sure you bring a Pokemon with strength! And before you battle Giratina, you will battle Cyrus, and you have to defeat him!
you need to have a Pokemon with the hm move strength touch the boulder and it will say if u wanna use strength say yes and there u go! hope i helped
if you saved the game before you did that , just turn it of and do it again.
Have a pokemon with strengthMove the boulders to a certain area (if you mess up it will reset)Keep moving until you reach Cynthia and CyrusAfter speaking to them you'll be able to battle Giratina (around level 47)