But having Heal Bell makes it even more one of a kind. I don't have XD though.
Today has been a harrowing tale of shiny hunting. I have spent around 6 hours SHing for Magnemite, SRing for Scyther, and doing double trouble with Charmander, and that can mean only one thing: yes, I got an extra FR today. So even if I have stiff competition, don't count me out at all. I've seen enough Magnemites today that any one now could be shiny. The new FR could open up alot of options, and already has past Charmander. I have an ID of 6 something, and I hardly ever get a 6 in my game IDs (seriously, it's almost always 30#0#. When I first started up my new FR I got that sort of ID and it's the same setup as FR1, and it took 310 hours to find the first shiny. That's not going to happen again.), so I feel lucky with it.
I myself wouldn't try doing 4 at a time. It was almost impossible doing 3 at a time. It just slowed me down and increased the chances of resetting on a shiny, AKA not paying attention. But 2 can be done, and that's what I do if I have the time and games.
Targets:
FR1: Scyther
LG: Charmander
FR2: Charmander
Emerald: Magnemite
Ruby: Holding
Sapphire: Holding
Good luck, I suppose.