Pokémon Ruby and Sapphire/Route 120

The first thing to do here is to find Steven and meet him. There's a bridge where he can be found a little outside of Fortree. He will use his Devon Scope to reveal a wild Kecleon which immediately attacks. It can be caught. After the battle ends, he gives the Devon Scope, allowing for entrance into Fortree city Gym. Upon returning to the area, if you keep to the north, you'll find two familiar faces.

Pokemon Found

Pokémon found (grass)

Sapphire	Encounter Rate	Ruby	Encounter Rate	Emerald	Encounter Rate
Linoone	30%	Linoone	30%	Mightyena	30%
Oddish	25%	Oddish	25%	Oddish	25%
Zigzagoon	20%	Zigzagoon	20%	Poochyena	20%
Marill	15%	Marill	15%	Marill	15%
Absol	8%	Absol	8%	Absol	8%
Surskit	1%	Surskit	1%	Seedot	1%
Kecleon	1%	Kecleon	1%	Kecleon	1%

Pokémon found (Surfing)

Sapphire	Encounter Rate	Ruby	Encounter Rate	Emerald	Encounter Rate
Marill	99%	Marill	99%	Marill	99%
Surskit	1%	Surskit	1%	Surskit	1%

Pokémon found (Fishing)

Sapphire	Encounter Rate	Ruby	Encounter Rate	Emerald	Encounter Rate
Old Rod
Magikarp	70%	Magikarp	70%	Magikarp	70%
Goldeen	30%	Goldeen	30%	Goldeen	30%
Good Rod
Magikarp	60%	Magikarp	60%	Magikarp	60%
Goldeen	20%	Goldeen	20%	Goldeen	20%
Barboach	20%	Barboach	20%	Barboach	20%
Super Rod
Barboach	100%	Barboach	100%	Barboach	100%

Trainers

Trainer
File:PRS&E Gabby & Ty.png	Interviewers Gabby & Ty Loudred (lvl. 30) Magneton (lvl. 30)

Head back across the bridge where you recently saw Steven, and continue on. As you move down, you'll encounter more trainers.

Ruby and Sapphire
File:PRS&E Bird Keeper.png	Birdkeeper Colin Natu (lvl. 29, 453 exp) Swellow (lvl. 29, 1006 exp)

Emerald
File:PRS&E Bird Keeper.png	Birdkeeper Colin Wingull (lvl. 28, 384 EXP) Natu (lvl. 28, 438 EXP) 896

Ruby and Sapphire
File:PRS&E Parasol Lady.png	Parasol Lady Angelica Castform (lvl. 30, 930 EXP)

Emerald (2 on 2)
File:PRS&E Parasol Lady.png	Parasol Lady Angelica Castform (lvl. 30, 930 EXP)
File:PRS&E Cooltrainer M.png	CoolTrainer Lionel Magnectric (lvl. 30, 1080 EXP)

In Emerald, to the right of Lionel and Angelica, you meet two more trainers looking for a 2 on 2 battle.

Emerald (2 on 2)
File:PRS&E Battle Girl.png	Battle Girl Callie Meditite (lvl. 28, 546 EXP) Mahuikita (lvl. 28, 522 EXP) 672
File:PRS&E Ninja Boy.png	Ninja Boy Riley Nincada (lvl. 28, 390 EXP) Koffing (lvl. 28, 684 EXP) 336

After Angelica in Ruby and Sapphire, or the 2 on 2 battle in Emerald, you meet more trainers.

Trainer
File:PRS&E Ninja Boy.png	Ninja Boy Tsunao Nincada (lvl. 28) Ninjask (lvl. 28) Koffing (lvl. 28)

Ruby and Sapphire
File:PRS&E Cooltrainer F.png	Cooltrainer Jennifer Milotic (lvl. 30)

Emerald
File:PRS&E Cooltrainer F.png	Cooltrainer Jennifer Sableye (lvl. 30, 630 EXP) 1,140

Move all the way to the right and cut down the tree here to gain access to an Aspear Berry Grove. Pick them, then go back to the path and head south.

Ruby and Sapphire
File:PRS&E Pokemon Ranger M.png	Pokémon Ranger Carlos Seedot (lvl. 29) Lombre (lvl. 29) Nuzleaf (lvl. 29) 1,344

Emerald
File:PRS&E Pokemon Ranger M.png	Pokémon Ranger Carlos Seedot (lvl. 28, 444 EXP) Lombre (lvl. 28, 846 EXP) Nuzleaf (lvl. 28, 846 EXP) 1,344

Ruby and Sapphire
File:PRS&E Pokemon Ranger F.png	Pokémon Ranger Jenna Lotao (lvl. 29) Lombre (lvl. 29) Nuzleaf (lvl. 29) 1,344

Emerald
File:PRS&E Pokemon Ranger F.png	Pokémon Ranger Jenna Lotao (lvl. 28, 444 EXP) Lombre (lvl. 28, 846 EXP) Nuzleaf (lvl. 28, 846 EXP) 1,344

Trainer
File:PRS&E Bug Maniac.png	Bug Maniac Jeffrey Surskit (lvl. 27, 364 EXP) Surskit (lvl. 27, 364 EXP) Surskit (lvl. 27, 364 EXP) 1,620