Houndoominite in Pokémon Radical Red

Once you’ve acquired seven badges, try to enter the Viridian City Gym and you’ll be stopped by Brendan. He’ll take you to the Cerulean Cave as part of a mandatory story plot.

After Brendan and Ariana start battling, follow the path North.

You’ll come across some water. Use Surf here to follow the water without landing anywhere else.

At the very end of this path, you’ll see some stairs you can use to get back on land.

Now you want to follow the path without taking any of the ladders you see on the way.

Eventually at the end of this path you’ll come across a ladder heading upstairs that’ll be on a separate platform. Use it to go to the Cerulean Cave’s maze area.

Now you want to walk left and then go down as soon as you can.

Follow this path and you’ll get the choice to take one of three paths. Follow the furthest path to the right.

Continue following the path, using Rock Smash to clear some rocks on the way, and you’ll eventually reach a ladder heading downstairs at the end of the path.

After going downstairs, you’ll see another ladder to your South.

As you approach it, you’ll be stopped by both Archer and Ariana who will challenge you one at a time, starting with Archer. But the Ariana fight doesn’t matter as much, since Archer will give you the Houndoominite upon being defeated.

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Rocket Admin Archer
Pokémon	Mamoswine Lv. 77	Durant Lv. 78	Mimikyu Lv. 79	Houndoom Lv. 79
Type	Ice / Ground	Bug / Steel	Ghost / Fairy	Dark / Fire
Ability	Thick Fat	Hustle	Disguise	Unnerve
Held Item	Focus Sash	Life Orb	Lum Berry	Houndoominite
Weaknesses	Fire (2x) Water (2x) Grass (2x) Fighting (2x) Steel (2x)	Fire (4x)	Ghost (2x) Steel (2x)	Water (2x) Fighting (2x) Ground (2x) Rock (2x)
Moves	Earthquake Ice Shard Endeavor Icicle Crash	Hone Claws Iron Head X-Scissor Superpower	Play Rough Swords Dance Shadow Claw Shadow Sneak	Fiery Wrath Flamethrower Sucker Punch Sludge Bomb