[Kate]

I just recently found out you can obtain the legendary trio dogs in their shiny forms this coming January and February. You have to go to a Gamestop near you to obtain them. However, they are on different weeks and can only be obtained in one week.

Raikou - January 3rd through January 9th
Entei - January 17th through January 23rd
Suicune - January 31st through February 6th

Each of them will have a move they don't normally learn. Raikou has Weather Ball, Entei has Flare Blitz, and Suicune has Sheer Cold. There's also other events that'll occur with them. That and other info can be read from the link below.

http://www.pokemongoldsilver.com/us/#/news/trio/