Cinnibar island, Fuschia city, the Pokemon league and two island and the other islands.
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You have to use Pokeballs, Great Balls, Ultra Ballsect.Many Pokemon can't be caught in Leaf Green, like Mew unless you go to an event, but all events for Leaf Green and Fire Red have ended.
Use master balls. Use a ton of ultra balls and put them to sleep or paralyze but master balls are your best bet since leaf green is harder than its original counterpart
Or, you could try not cheating and play the game?
GAMESHARK-codes.Pokemon Leaf Green Mastercode00000554000A101DC9B00007830050000000830050020000Have All Pokeballs420259D800010001000C0004420259DA52120000000C0004
Hi. You have to use the gameshark code for it. Hope this helps.:)