Get more friends.
Keep battling them.
Trade items.
Trade even more items.
Dash into trees.
Go back and forth into more trees in the same place.
That's all there is to it.
berries appear every day, so just start from your hometown and pick up the berries from the little trees every day
the miracle berry is only available as a mystery gift item
This berry restores up to 5 pp of a move. The link below lists the effect of each berry.
look in the trees by pressing a by the tree
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Berries are found on berry bushes scattered around the map.
No, a Pokemon can only hold one item or berry at a time.
in diamond you can give them a certain berry and they will like you more (that is, if you can find the berry).
The Action Replay does not work on gen 2 games. So, no. There isn't.
some trees that look like berry trees may have a Capricorn
Pataya berries must be obtained from either Pokemon colosseum or Pokemon xd gale of darkness trade a Pokemon holding the berry to emerald then plant it to get more.
crystal does
I preference pokemon crystal