You can still find brand new versions of Emerald version on Amazon.com, and used ones could be found at ebay.com.
You can find Volbeat on Route 117 in Pokemon Emerald Version.
sorry, you can't get riolu in Pokemon emerald version.
in the suber
you need action replay
there is no friendly berry
in which version ? In emerald you can find it easily at Mt Pyre
you cant you have to migrat
sootopolis city
mirage tower or desert underpass
you can find dive balls at the mossdeep city pokemart
Up your butt an around the corner
It's only available in Emerald Version at the Battle Frontier.