go to cinnabar island and once you beat the Pokemon mansion Bill will come out and offer you to go with him to first island.
he isn't in the one island
One island in the north.
he is in one island in the hospital.
Give it to Celio on one island.
You get a map from Celio, on one island.
If you mean Celio, his in one island pokemon center.
on island one in the graas by the spa
North of One Island.
After fixing the Network Machine on One Island, you can trade a Mudkip from Pokemon Ruby or Sapphire. You can't catch a Mudkip in Pokemon FireRed.
Noctowl nor hoot-hoot can be caught in firered you need to get one from emerald.
Growlithe is found in the Pokemon Mansion on Cinnabar Island in Pokemon Firered.
on cinnabar island