Pokemon Special Missions

[Ture pokemon master]

Hi, I need help. For some reason I'm unable to do the kyogre Mission. Why is this?

[Mawile-Danmaku]

You have to capture Entei to do Kyorge/Groudon/Rayquaza missons.
After that, vist the ranger base in fall city, then vist professer hastings. it's all downhill from there.