I don't know what cave you are talking about, but here is an example of a cave: DARK CAVE. I hope this helped!
you can't go to hoenn in Pokemon heartgold/soulsiver...
you are in the Pokemon legue then go out go in the cave and go to the left stairs in the cave then you find your way.
Outside the Chargestone Cave.
You Can Go Into This Cave Once You Have Beaten The Pokemon League. Cerulean Cave Is Where Chanseys And Mewto At LVL 70.
You can find Caliban in Pokemon black. Go as if you were going to Charge Stone Cave. Stop at the mouth of the cave. Then, turn right. You should see some stairs. Go down the stairs. Turn right. Go through the tall grass. Surf on the lake. Keep going until you see a cave. Go into the cave. One of your Pokemon will need to know flash. Keep going to the back of the cave until you find stairs. Go up the stairs. Go to the far back left of the cave and Caliban should be there.
The black flute can be found in Dark Cave in Soulsiver.
The same place as gold heart. In the back of a secret cave your mom tells you about.
you can't go to hoenn in Pokemon heartgold/soulsiver...
you get it from an event
Pokemon soulsiver and Heartgold are $34.99.
If you got both Kyogre and Groudon, take them to Mr. Pokemon and he'll give you a Jade Orb. You'll, then, need to return to Embedded Tower.
yes you can in mt.silver
You have to enter the Hall of Fame.
no but you can go to kanto
you are in the Pokemon legue then go out go in the cave and go to the left stairs in the cave then you find your way.
just open the door ;)
Just south of goldenrod city