If you mean super potion, buy it at the store.
If you mean SpecialPotion to heal Amphy, Cianwood city across the ocean.
go to the pokemon mart and buy it
talk to jasmine in the lighthouse at olivine city and then go to cianwood and talk to the pharmasist
secret potion. you can find it at the olivine city in that medicine shop.
Yes, beating the 7th Gym does not effect getting the secret potion.
some ether, awakening, maybe a super potion
u first need to talk tyo jasmine in the light tower then go to the guy that gives it to you that's the only that he give you the super potion
Pokemon belongs to gamefreak, but Yoshi does not. He is part of the Super Mario franchise and Nintendo.
I know that you get the super rod in Route 12.
Here are the items you can get in Pokemon GO:Camera (For taking pictures of Pokemon. You get it automatically.)Great Ball (For catching Pokemon. Better than a Poke Ball, but not as good as an Ultra Ball.)Hyper Potion (For healing Pokemon. Better than a Super Potion, but not as good as a Max Potion.)Incense (Attracts Pokemon to your location.)Incubator (Hatches eggs. One permanent one you get automatically, and you get other temporary ones from leveling up or in the store)Lucky Egg (Doubles your XP for 1/2 an hour.)Lure Module (Attracts Pokemon to a PokeStop.)Max Potion (Heals Pokemon. Better than a Hyper Potion.)Max Revive (Revives and heals Pokemon that have fainted completely.)Poke Ball (Catches Pokemon. Not as good as a Great Ball.)Potion (Heals Pokemon. Not as good as a Super Potion.)Razz Berry (If you feed this to a Pokemon, it becomes a little easier to catch for one throw.)Revive (Revives and heals Pokemon that have fainted halfway to full health.)Super Potion (Heals Pokemon. Better than Potion, but not as good as Hyper Potion.)Ultra Ball (Catches Pokemon. Better than a Great Ball.)You can also buy bag upgrades and Pokemon storage upgrades, but they aren't really items... you just buy them and it increases the applicable storage.
There is only old, good, and super rods in Pokemon Heart Gold.
Talk to the fishing guru in route 12 in Kanto.
You can find them in the Whirl Islands by Surfing or Fishing with a Super Rod.