I play them on emulators fairly frequently, mainly for challenges/other interesting runs these days. I played Red and Yellow a bit last summer to make some teams for Stadium 1 and 2 (which I finally beat after nearly a decade), and they were working fine when I checked them at Christmas, but I don't know if their still working now or not. My Gold, Blue, and Crystal games are dead, but I recently bought some new batteries in hopes of getting them working again (though I think Blue has other, unfixable problems beyond the battery issue). At this point, only Red, Yellow, and Silver still work from the first two generations, but I don't want to put that much more time into the actual cartridges until the batteries die and I have to replace them, as I figure they won't last much longer anyway.