This forum doesn't have any posts in it, so I'm gonna post one of my tips in it. I hope this one helps.

Did you know that you can get as many Rare Bones and Stardust as you like in Turnback Cave? Just keep right, left, up or down, until you eventually hit a room with an item in it. It lets me do this as many times as you want. You can sell Rare Bones are 5000 in Marts. I'm not sure how much Stardust are worth, though. Probably the same. I believe you unlock the Turnback Cave after you get the National Dex. it's located under Veilstone City. You can also find Giratina somewhere in it. I also suggest having pokemon over level 70 while in there. The wild pokemon levels go up to level 66. Max/ Super Repels would also be nice.