It is possible to have good stats on your dogs. I can't remember their exact stats off the top of my head, but my Suicune can take hits all day, my Entei slaughters anything with high attack, and Raikou owns everything with high speed and Special Attack.
I am sharing (sort of) this account with my younger brother.
Somehow we both got the same first shiny, no hacking, just dumb luck.
Games between us:
Sister: Fire Red, Ruby, Emerald, Diamond
Brother: Blue, Leaf Green, Sapphire, Pearl, Red Rescue Team