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Pokémon FireRed & LeafGreen+: Marsh Badge — the sea routes and Cinnabar Island

What opens up at this point in the game, and everything you can catch by now that you couldn't before.

✓ Routes 19, 20 and 21, the Seafoam Islands, Cinnabar Island and the Pokémon Mansion, up to Blaine. Challenge Mode's Blaine tops out at Level 51.

Newly reachable

Cinnabar IslandCinnabar Island Pokémon Lab EntranceCinnabar Island Pokémon Lab Experiment RoomPokémon Mansion 1FPokémon Mansion 2FPokémon Mansion 3FPokémon Mansion B1FRoute 19Route 20Route 21 NorthRoute 21 SouthSeafoam Islands 1FSeafoam Islands B1FSeafoam Islands B2FSeafoam Islands B3FSeafoam Islands B4F

Newly catchable (12)

AerodactylAerodactylArticunoArticunoDewgongDewgongGolbatGolbatGolduckGolduckKabutoKabutoMukMukOmanyteOmanyteSeelSeelSlowbroSlowbroTangelaTangelaWeezingWeezing

TMs you can now pick up

  • TM14 Blizzard — Pokémon Mansion B1F (pick up)
  • TM22 Solar Beam — Pokémon Mansion B1F (pick up)
  • TM38 Fire Blast — Cinnabar Island Gym (pick up)

Bosses around here

Blaine — Lv 47Blaine — Lv 51