Appendix:Red and Blue walkthrough/Section 17: Difference between revisions

Congratulations, you are now the Indigo League Champion! This new title grants access to an area that was previously off-limits, Cerulean Cave, due to the large number of powerful wild Pokémon inside. It is here that the violent specimen fled to from Cinnabar Island after destroying the research facility it was being kept in.

This is a treacherous cave, with not only powerful Pokémon, but a wide variety of species as well. Stock up on Ultra Balls and bring the Super Rod along. Bring a Pokémon that can surf, and withdraw that Master Ball from the PC. Mewtwo is one tough fighter, and even harder to catch than the legendary birds, so if you used it already, you're in for a long battle. Head north to Route 24, surf south on the water near the bridge, and enter the cave on the south shore.

Cerulean Cave

This cave is packed with powerful Pokémon. Some are species only found in the Safari Zone, while others are evolved forms, like Raichu, Kingler, and Marowak.

1F

Available Pokémon

B1F Pokémon Games Location Levels Rate Rhydon R B Y Cave 55 25% Electrode R B Y Cave 55 15% Marowak R B Y Cave 55 15% Raichu R B Y Cave 64 10% Parasect R B Y Cave 64 10% Chansey R B Y Cave 64 10% Ditto R B Y Cave 63-67 10% Arbok R B Y Cave 57 5% Sandslash R B Y Cave 57 5% Fishing Magikarp R B Y Fishing Old Rod 5 100% Poliwag R B Y Fishing Good Rod 10 50% Goldeen R B Y Fishing Good Rod 10 50% Slowbro R B Y Fishing Super Rod 23 25% Krabby R B Y Fishing Super Rod 23 25% Seadra R B Y Fishing Super Rod 23 25% Seaking R B Y Fishing Super Rod 23 25% Special Pokémon Mewtwo R B Y Only one 70 Only one A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here. 1F Pokémon Games Location Levels Rate Golbat R B Y Cave 46 25% Magneton R B Y Cave 46 15% Hypno R B Y Cave 46 15% Arbok R B Y Cave 52 10% Sandslash R B Y Cave 52 10% Venomoth R B Y Cave 49 10% Dodrio R B Y Cave 49 10% Parasect R B Y Cave 52 5% Kadabra R B Y Cave 49 5% Raichu R B Y Cave 53 4% Ditto R B Y Cave 53 1% Fishing Magikarp R B Y Fishing Old Rod 5 100% Poliwag R B Y Fishing Good Rod 10 50% Goldeen R B Y Fishing Good Rod 10 50% Slowbro R B Y Fishing Super Rod 23 25% Krabby R B Y Fishing Super Rod 23 25% Seadra R B Y Fishing Super Rod 23 25% Seaking R B Y Fishing Super Rod 23 25% A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here. 2F Pokémon Games Location Levels Rate Dodrio R B Y Cave 51 25% Venomoth R B Y Cave 51 15% Kadabra R B Y Cave 51 15% Electrode R B Y Cave 52 10% Marowak R B Y Cave 52 10% Rhydon R B Y Cave 52 10% Wigglytuff R B Y Cave 54 5% Chansey R B Y Cave 56 5% Ditto R B Y Cave 55-60 5% A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.

From the entrance, walk up onto the rock slab and take the stairway to the 2nd floor.

2F

This floor is an absolute maze, though each section is pretty straightforward. Loop around to the east, grab the PP Up, and take the stairs in the northeast back down to the 1st floor.

1F

Walk down the steps and glide into the water. Grab the nearby Max Elixir, and step onto dry land just west of the item. Grab the Nugget and head up the stairs.

2F

Pick up the Full Restore, and head down the next set of stairs.

1F

From here, walk all the way left and then down to reach the water. Surf to the west to get another Full Restore, then walk back onto the rock platform. Head south, and follow the trail to the next stairway.

2F

Pick up the Ultra Ball, and take the stairs in the northwest to the 1st floor again.

1F

Follow the short trail, and take the stairs to the basement floor.

B1F

Head northeast from the stairs, walk down the steps, and head east to find a Max Revive. Walk to the southwest, and up onto the rock ledge for an Ultra Ball. You're almost to the final legendary! Surf across the small pond, loop around on the next rock ledge, and swim to the south. Mewtwo is waiting on his island.

Mewtwo

The master of Cerulean Cave

Not only is it the strongest Pokémon in the game, but when you find it, it's already at Lv 70! If you don't have the Master Ball, this is going to be even tougher than catching the legendary birds. Like with any legendary, SAVE THE GAME before approaching it; with only one shot, you don't want to mess this up. Most damage you inflict will probably be healed right away, since it can use Recover 10 times. His only real weakness is Bug-type moves, so a Pin Missile attack from a high-level Beedrill or Jolteon could prove useful, though his Psychic move can decimate the health of any non-Psychic-type. You may want to dispatch the legendary birds against him, since he is the only thing stronger than them. If you do have the Master Ball, than all you have to do is throw it right away, don't even bother battling with it. A good strategy to catch it without the Master Ball is to send Articuno to use Ice Beam or Blizzard, since it can't attack or recover its health if it's frozen.

After all of that, use an Escape Rope (otherwise backtrack to the entrance) to exit the cave. You have now passed every challenge in the game, though you may still have holes in your Pokédex data. With nothing else to do, all that's left is to complete the Pokédex for Professor Oak. If you manage to do it, remember to show it to the Game Freak employees in Celadon for your reward.

This article is part of Project Walkthroughs, a Bulbapedia project that aims to write comprehensive step-by-step guides on each Pokémon game.