You must give the Secret Medicine, which can be obtained at Cianwood City.
Jasmine? You need to head to cianwood and get the secretpotion form the pharmacy :)
you need to finish the team rocket HQ story where you have to battle
u need to push the snowballs around and find a path to her like to pryce the seventh gym leader in pokemon soulsilver and heartgold
The fifth gym leader is Pokemon HeartGold SoulSilver is Chuck. He is in Cianwood City, but in order to get there you need surf.
You'll need to trade for it from Pokemon HeartGold. It is not avilable in the wild in Pokemon SoulSilver.
there is a mew in Pokemon soulsilver but you need to catch all leadndery Pokemon including event Pokemon
Go south, then east from the beach using surf, then go to the pharmacy and get the medicine.
You can't. You need to get Heatran from Pokemon Diamond, Pearl and Platinum and then trade to heartgold and soulsilver.
The SS Anne is not in HeartGold or SoulSilver however when you arrive in Kanto you'll arrive in Vermilion City so you go and challenge the Gym Leader there.
No
You need to trade it from HeartGold/SoulSilver.
You'll need to trade for it, because evolving Feebas will be impossible in Pokemon HeartGold and SoulSilver.