Thank you for telling me that.
Wow this is horrifying. What a downer. I had so many event pokemon, EV trained, IV bred, and shinies. I have played since Blue version and those pokemon were from my ruby/sapphire and above. The worst part is I spent forever breeding a pikachu with perfect IVs and trained him to be a special sweeper with the lightball but he was lost in the one game I've ever misplaced- my diamond version. All my favorites are gone.
I suppose there is a freedom in having nothing to look back on. I can pick up a new game and start fresh.
Mhm :( You HAVE always got the memories though (and that's the best part really!), hold onto them, and maybe even name some of your new Pokemon after your old ones. Maybe you could do up a personal travel journal of your own where you write down your best memories with your Pokemon while they're still in your memory. It's a silly idea but something you can do so you'll never forget!