You have to talk to one of those hikers underground and one will give you a drill thing. Use it on a wall and you can trade the berries in Flamora town to put things in your secret hideout.
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first you need a underground kit from eterna city and do some kind of tests until you get to the test where you can make your secret base.
you get a digger drill from an old man in a house next to the PC or you can buy it from hikers for about size 11 spheres
get pokesav from pokesav.org and make a cheat for pokemon you want in pokemon diamond. ----
You have to get strength, and teach it to your pokemon. It is so easy a caveman can do it.
Leave it with the nursery