you have to stop kyogre and groudon from fighting...to do that you have to get rayquayza to fly away at the sky pillar... you hacve to beat the sootopolis gym but Wallace or steven will give it to you before but you have to beat the final gym to use it
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Look at the gym in Mossdeep city beat the gym leader in Sootopolis City and then talk to Steven in his home town Team Magma should be there beat them and he will give it to you.
beat the 8th gym
you recieve the hm waterfall after you have deafeated the elite 4
it is in the Pokemon league where you use waterfall
Get the waterfall hm!
to enter the elite four