you cant
You can't get to Four Island in Pokemon Red Version.
There is no such island in Pokémon Red.
beat the 7th badge, and you will be taken to it
At the ppl in the sea or 1 island
you can't get him on emerald ruby or Sapphire. you have to trade him from Pokemon leaf green or fire red to emerald. on Pokemon fire red and leaf green you get him at the end of island 1.
In Leaf Green And Fire Red, for Johto Pokemon you need the national pokedex; this was obtained when you gave the blue and red gems to Celio in Island 1
Give the rubies to Ceile on 1 island then he will give you a pass to acess 4-7 island where you can breed and capture legendary pokemon.
Moltres is found at the top of Mt. Ember in Island #1 Jean
Ofcoure..But You Will Need Ruby and Saphire Stones Form Island 1 2 or 3...
Just go to the 1 Island Pokemon Center, go upstairs, and trade.
its on cinibar island just like red blue and yellow
there is no mushroom island.