Well my Shiny Suicune hunt begins tomorrow. A friend of mine is lending me his Fire Red but I may have to restart it. He said it was OK. However I can get to the HoF at any time using the Magic Door Codes at codejunkies.com, which means I can begin the hunt almost immediately. Wish me luck. Oh here's a step-by-step guide for catching a shiny dog:
0.5) Trade the dog over from another game so you know where to look for him. (If you've already seen him in your game and he isn't shiny, he will never be shiny. Incidentally, if he is shny and escapes, he will remain shiny forever.)
1) Buy some Max Repel.
2) Keep searching until you've cornered the dog.
3) Save.
4) Use Max Repel and search in the grass until you find him. (For those of you who don't know, Repel will repel all pokemon in the area EXCEPT the legendary dog hiding there.)
5) If he isn't shiny, reset and repeat step 4 until he is.
Well that's the way I'll try to catch him. This would also work for Lati@s in R/S/E.