go to the underground part of ruins of alph. you'll run into them if you run around.
nothing happens
not all all but there is alot of them
look at them
No
catch all the pokemon.
Explore!
you get celibi
yes you can catch all of the legendary dogs, they wander and you can see them on the pokegear map
After seeing it in all places, it will appear on Route 25.
Use Action Replay
You cant catch him. he is given to you by steven at silph co. after beating all the gyms and the trainer Red, who is at the top of mnt. Silver.
all of them