Yes, it's possible to trade between HGSS and DPPt. The loveball, however, will become a pokeball in DPPt. Any pokemon you give me will be released after the trade. So don't bring any special pokemon for this trade. Just bring a junk pokemon to trade for the ditto. It's a free ditto.
Ok, so check to see if I'm on tonight around 7. Right now, I'm getting my kids ready for school.
Sure you can have the ditto, however this weekend is very bad for me to do any distributing. I have relatives over and very little time for gaming or the computer. If you're on line at all in the evening Monday to Thursday (between 7 and 8 PM EST) let me know.