Pokémon Heart & Soul: Beat Leader Morty — Ecruteak City Gym, badge 4

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

Now usable

• Good Rod — the Good Rod (found at Olivine City)

Newly reachable

Newly catchable (44)

ArbokChanseyChinchouCorsolaDewgongDoduoDratiniFarfetch'dFearowGirafarigGligarGloomGyaradosHaunterHorseaKabutoKinglerMachokeMagnemiteMagnetonMantineMantykeMeowthMiltankMr. MimeNidorinaNidorinoOmanytePonytaQwilfishRemoraidRhyhornSandslashSeadraSeelShellderShuckleSkarmorySkiploomStaryuSteelixTaurosWeepinbellXatu

TMs you can now pick up

• TM01 Focus Punch — Cianwood City Gym
• TM49 Snatch — Route 39
• TM57 Charge Beam — Olivine City
• TM60 Drain Punch — Route 39
• TM87 Swagger — Olivine Lighthouse
• TM88 Pluck — Route 40
• HM02 Fly — Cianwood City
• HM04 Strength — Olivine City

Bosses around here