Yes, they are the Legendary Dogs; Entei, Suikun, and Raikou.
Though, they names may differ in the English versions. It's been the longest time since I had played Gold/Silver.
On the topic of Pokémon Colosseum, I had considered purchasing it, though I hadn't wanted to do it blindly. I had read your review of it, Meowrik, and decided to get some other opinions.
I ended up not buying it, mainly due to the fact that the "rental" feature from the original Pokémon Stadium (II jp) and Pokémon Stadium II (III jp) wasn't included.
As for the single player mode, I wasn't so interested in that, for I had read the story to be quite simplistic, as well as any puzzles to be underdeveloped. To what I understand, it promises a good 30 hours of game play, but 90% of that is spent battling. However, I may still give it a shot, sometime.
I did have one concern, though. In order to transfer Pokémon from Ruby/Sapphire, one would need the GBA -> GCN cable, correct?
Also, this isn't a thread to discuss what you think of the Pokémon series, so if you've nothing to add on topic, it'd be best for you to add nothing at all. Thanks.