the third gym's HM is Strength. Receive from the Hiker who comes out of Mt. Mortar on Route 42
Train it.
you go to ecruteak city
It attracts a ledendary pokemon.
curmen cave
this is also for heart gold
evolve gastly.
you have to use hm rock smash on rocks to find them.
You can find them by surfing and fishing.
It's Darkrai. You can't get him in Heart Gold.
pokemon heart gold
Well I do have the game. I did see suicune in it.
Pokemon Heart gold is different from Pokemon Gold cuz heart gold has better graphics new Pokemon and new events