Hmm, I fail, but its try nunmber 2 now

Ok, so I went to kill dark diagla and although dieing and needing rescuing I finally get there, and I notice Ive got no sleep seeds....
So I start attacking and he roar of times, leaving my partner on low life and k0ing me, I was level 36 at the time

I have now trained up to level 40 on me and my partner, I have 7 sleep seeds and 7 revivers, and a few x-eye, will I be able to defeat Dark diagla?

I think you should be able to

Ok well ill atempt soon

if you dont suceed, use my strategy, get a stun seed, stun him, nasty plot/stockpile, watever move you have that raises stats, use it, then throw a sleep seed at him then throw a vile seed at him, which leaves his defensive stats at 1/8 of wat they're supposed 2 be, then go in and use your strongest attacks

Dude, you will cane him. Prepare to be owned Dark Dialga.

Another tactic that might help,
Use attacks from a distance, seems to weaken roar of time

LOL ive beaten him now USed 6 reveivers :D roar of time kinda 1 hit k0ed me but my partner could live em

lol, thats y munchlax with stockpile is brilliant. With it all set up, roar of time did lyk 20 damage

Use linked moves. They'll be your best friend during story mode and when capturing outlaws. It would be easier if I knew what you and your partner was then I could give some linked moves suggestions. BUt yeah, use long distance moves, but if you have to use a close combat move, then make sure it's a powerful move and you know a HP restore move.