I reckon I do. I used Sapphire for storing team members from Ruby and Emerald for a long time. Then I got another Emerald and traded ALL my stuff from Sapphire to it (and that was boxes and boxes of stuff, man). So I have some Pokemon on my Emerald that are at least...7 years old. All the way from 2003. At one point, before I got my other Emerald, I turned on my Sapphire to play and it told me the battery was dead and gave me the option for a new game and BOY did I cry. I turned off the game immediately and cried so loud my mom came back (and she was having some kinda party too, lol embarrassing little boy I was) to my room to see what the dealio was. Then I left it alone for about an hour and turned it back on and by some miracle, it was completely fine. I had all my stuff still. :'D
If I didn't have some place in my heart for that data, I would not have such old Pokemon stored up<3
And don't get me started about Red and Silver stuff...lololol