Battle park. 16 Battle Points. Available after you beat elite four.
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you get it at the battle frontier.
You go to the Battle Frontier and use B. P. and buy it at a counter.
Please see the related link below. The Embedded Tower is in the same location as it is in HeartGold, only you need a Red Orb instead of a Blue Orb.
Go for breloom since he has poison heal witch is useful with the toxic orb. Beloom also has the move spore witch is great with focus punch.
Let Palkia hold the lustrous orb, and let Dialga hold the adament orb. It boosts their special moves' damage.