you unlock the APC
there is no sepcific way to unlock them. you just keep playing. i have unlocked some mostly playing my player and the Jordan challenge's/MJ: Creating a Legend.
you can go to kanto and get all the kanto badges. that will unlock mt. silver, which you can climb to challenge the trainer red.
you can challenge them after you get the first 8 gym badges
No, it does not. you can challenge the Elite four as much as you like.
You challenge the Elite 4.
find the guy with the red hat in the woods and challenge him 2 a duel if you win you unlock an ultimate Pokemon then you move on in the game. (vid part 1)
To unlock Groundon, you must beat the Elite Four and talk to the weather man.
no you can only get an elite puffle if you own the game herberts revenge and unlock the hat for a black puffle
Look at the bottom right corner of the map. The elite four can be found there
You need to wait until later in the game when you are in races against the special cars that you can unlock during the game (like the Logitech Racer and Elite Racer).
You unlock it in the further game difficulties.
You go challenge the Elite Four.