You can transfer Pokemon from the Gen III games to the Gen IV games, and can from there transfer them to the Gen V games. See the huge number of questions and your Gen IV Game Manuals that came in the game case for more detail. This may require some reading, but I'm sure you can do it!
And just a tip, people here don't like it when people ask an easily looked up question, especially when it can be read in the game manual and not even require an internet search.
