To use PGT/PCDs (collectively known as Wondercards), you can use Grovyle's Mystery Gift Editor, which should support both gen 4 and gen 5.
If you want to activate the actual event, you need a flash card or AR (and them, subsequently, to make the AR code).
If you want just to send a pkm file to your game, you need a flash card, an AR, or you can use IR-GTS programs or just use www.pokegts.com and/or www.pokecheck.org.