Walkthrough
Located within the Green Path is Pattern Bush, a giant forest home to many Pokemon Trainers and Wild Pokemon (including a number of Pokemon Species that can only be found in this specific area).
Wild Pokemon
Grasses:
Spinarak(FireRed)/Ledyba(LeafGreen) (30%): Levels 9-14
Kakuna(FireRed)/Metapod(LeafGreen) (20%): Level 9
Heracross (20%): Levels 15-30
Catepie (10%): Level 6
Weedle (10%): Level 6
Ledyba(FireRed)/Spinarak(LeafGreen) (30%): Levels 9-14
Metapod(FireRed)/Kakuna(LeafGreen) (20%): Level 9
Pokemon Trainers
Youngster Cordell: Level 48 Farfetch'd, Level 48 Farfetch'd
Pokemon Breeder Bethany: Level 50
Bug Catcher Garret: Level 49 Heracross
Bug Catcher Vance: Level 48 Venonat, Level 48 Venomoth
Lass Joana: Level 49 Snubbull
Youngster Nash: Level 47 Weepinbell, Level 47 Weepinbell, Level 49 Victreebel
Ruin Maniac Layton: Level 48 Sandslash, Level 48 Onix, Level 48 Sandslash
Picnicker Marcy: Level 48 Paras, Level 48 Paras, Level 49 Parasect
Pokemon Breeder Allison: Level 48 Clefairy, Level 48 Clefairy, Level 48 Clefable
Bug Catcher Jonah: Level 45 Yanma, Level 45 Yanma, Level 45 Beedrill, evel 47 Beedrill
Lass Dalia: Level 46 Hoppip, Level 47 Hoppip, Level 47 Skiploom, Level 48 Skiploom
Camper Riley: Level 49 Pinsir, Level 49 Heracross