When I beat him?
You can recruit him after the 2nd time you beat him. To get to Temporal tower again, you have to go and tell Lapras to take you to the Hidden Land, after you beat Hidden Land (Again) you can choose to go to Temporal Tower or return.
No, you have to beat him twice.
Yes, there is of course. Thing is, you can't recruit primal dialga but you can recruit him regular once you go to temporal tower again. Trust me, i have him.
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