The first item shop you go to is in sand gem town.it has a blue roof.
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A: the herb shop is in Eterna city
The bike shop is in Eterna City.
Of course, how else would you get sizor and steelix. just give the Pokemon an item and trade!
Yes, it is possible to trade items in Pokemon Pearl but, this is only allowed if you trade the item when it's attached to a Pokemon. If you are trading with a friend and don't want him to have your Pokemon just trade back.
no Simple as that!hj