I just started Kanto, but haven't even caught Entei and Raikou yet. Also, I have to follow Suicine's random travels. I'm going to have to stick my Lv.40 Cut user (which I actually spent time leveling holding an Exp. Share on Route 26, then dumped prior to the E4).
I know once I activate a certain event, Latios will start roaming. I can't even get to Pewter City yet, and thus Action Replaying myself an Enigma Stone does no good until then; at least she stays stationary! :D Once the Power Plant events are completed, I'll obviously be able to get around to the Viridian City side (first stop: the gatehouse opening the Johto-Kanto pathway by Victory Road), then I will consider the Enigma Stone and travel up to Pewter City. Of course, I COULD Action Replay a path to Pewter now (walk through walls), but that would just be cheating, marking a Fly point in Pewter without doing the Power Plant; we can't have that now, can we? ;)
Sorry to hear you're sick - get well soon. :)