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You can use the Card Key to open up all doors in the building for some extra items and battles. However most importantly open the door on the third floor and open up the next door after it. Keep going, and when you reach Gary (your rival) you will know you are on the right way to the Silph Co. owner and the Rocket boss Giovanni.
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Where do you get a key card in Pokemon Yellow?
You need to head to Level 5, you will see a Pokeball, use the warp panel Back and Forth, the Pokeball will have the Key Card.
How do you get the card key on the in Pokemon Yellow?
go to silph co. its on floor 5 then once you have it go to floor 9
Where is the Card Key in Pokemon HeartGold and SoulSilver?
The card key in Pokemon Heartgold and Soulsilver is located in the Goldenrod Underground.
What is the secret key for in Pokemon Yellow?
if you got it from the Pokemon mansion it opens the cinabar Pokemon gym
Where is the card key in pokemon yellow?
The Card Key that is used to open special doors is hidden in the Silph Co building. It is on the fifth floor of the building, near the southern end of the room. However, there is a Rocket agent and a Warp Panel in your way. If you find that you need to heal your Pokemon while in the Silph Co building, keep in mind that a healing station is on the ninth floor - but you need the Card Key to access it.
