You do not need to go to Seafoam Islands to pass the game, but you might want to get there to catch Articuno.
If you have yet to defeat the Elite Four you can always Fly to Pallet Town and surf SOUTH until you reach Cinnabar Island.
However, follow these instructions to make it to Seafoam Islands and out to the other side. Remember to: buy extra pokeballs, greatballs and ultraballs (I suggest carrying 30 of each pokeball, greatball and ultraballs), and bring your masterball if you still have it. Make sure you heal your Pokemon; and bring Pokemon of at least level 55. Articuno is at level 50 and it WILL put up quite a fight.
Go towards the south on Fuchsia City until you reach the coast. Surf down then turn to the left to reach Seafoam Island. There will be a cave there, get inside.
When you enter the cave, you can see a boulder to the right and a hole. Make one of your Pokemon push the boulder through that hole.
On that same floor, there is another boulder to the other side, so ignore the ladder for now, go to the other side and push that other boulder into the hole once again.
Do not go into the ladder, go back to where the first hole is and drop down through it. Make sure you push the boulders into those holes, they will be necessary to block the current, so that you can surf in the cave's lower level.
The rest is pretty much self explanatory, once you go up the opposite ladder and the second boulder is set you can surf toward the left. You will find a similar puzzle toward the south, find a way to get one boulder into one hole and another in the other hole. If you drop two boulders into the same hole, don't worry just drop down one of the holes and use the ladders to bring you back to the level and try again.
Once the boulders are in the right place, you can drop down one of the holes and either surf up (to the left) to get Articuno. Once you have captured Articuno, get to land and make sure you take the upper right most ladder. This will take you up until you can get to the other side.
Good luck!
cinnabar islands
You can't because there is no Pokemon Center in Seafoam Ilands.
Aerodactyl comes from the old amber you need to revive it on seafoam islands on Pokemon leaf green and fire red , the coal museum in oreburgh on diamond and pearl. hope this helps!
seafoam island is there but somehow you just have to find a way to get there because the 7TH gym leader BLAINE is there who uses FIRE type..also RAIKOU always stay in the tall grass in OLIVINE city and ENTEI in BLACKTHORN city
Zapdos: Power Plant top floor, level 50 Moltres: Mt. Ember on One Island in the Sevii Islands, level 50 Articuno: Seafoam Islands, level 50
cinnabar islands
You can't because there is no Pokemon Center in Seafoam Ilands.
Seafoam Islands.
in the second island of seafoam islands. its on the right of the fire gym
seafoam islands seafoam islands
If you mean Articuno, its in the Seafoam Islands. If you mean Delibird, its found in Fire Red Version.
That Pokemon is Articuno. Very Good Against Lance and his Dragon-type Pokemons. (Ice Attacks)
The seventh gym is not actually in a city - it's in the Seafoam Islands, east of Cinnibar Island. You fight Blaine, who uses Fire-type Pokemon and was the former Cinnibar Island gym leader, but had to take residence in the Seafoam Islands after the Cinnibar Island volcano erupted.
You get Overheat (TM50) from Blaine in the Seafoam Islands. He is a Gym leader and only gives it to you after you beat him. he is a fire-type gym leader.
Actually there's no gym leader in Seafoam Island.That's only a cave connecting the way for Cinnabar Island in Kanto Region.Im not familiar with Pokemon heart gold but i know about Seafoam Island coz im playing Pokemon Fire Red,too.There's a Seafoam Island there.Ok?
Power Plant is Zapdos, Seafoam Islands cave is Artincuno, And Island 1 for Moltres(at the one fire mountain thing,forget what it is called sorry...)
Aerodactyl comes from the old amber you need to revive it on seafoam islands on Pokemon leaf green and fire red , the coal museum in oreburgh on diamond and pearl. hope this helps!