This guide is outdated. Use this one instead.
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Often times, people wish to edit their Pokemon save file with PKHeX, but can't because they either don't know how, or don't have the hardware.
This guide is intended to show the easiest ways of backing up (and restoring) save files either with what you have, or to show you what you need to buy.
Do you have a 3DS with CFW? (See this guide for details).
Yes:
No:
I have insufficient hardware. So what now?
Oh, by the way, if you have Pokemon HeartGold/SoulSilver, and need a special backup tool for that (like if you have the NDS Backup Adapter, not the plus version), you can try this if you are confident enough: http://gbatemp.net/topic/215641-pokemon-soul-silver-sav-tofrom-cartridge-success/