You just walk on the grasses and you will find it. (It must take long times to find it.)
Most strong Pokemon can be found also at seven island
Wild Pokemon level 50 and higher can be found at seven island and cerulean cave.
Northern part of Seven Island
Island seven.
yes there are unown Pokemon in fire red. you have to go to the Tanoby Ruins on seven island
you have to go to 4 island NOT
You cannot get to Fire Island on Pokemon LeafGreen. Fire Island is a setting exclusive to the second Pokemon movie, Pokemon the Movie 2000.
you'll have to get the HM "water fall" i can't remember exactly how to find that though
there is no such thing not till ruby
One island Pokemon centre after you defeat elite four and the 2 rockets at the volcano and find the gem.
You get access to four, five, six and seven island :)
Fire types can be found scattered around the routes of kanto if one area had the most fire types it would be one island.