Pokémon Gold & Silver: Beat 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

• Surf — Surf (HM03, Ecruteak City)
• Surf (swarm) — Surf (HM03, Ecruteak City)

Newly reachable

Newly catchable (9)

DratiniGolduckHorseaMantinePoliwhirlPsyduckSeakingSlowbroTentacruel

TMs you can now pick up

• TM30 Shadow Ball — Ecruteak City Gym

Bosses around here