How does one unlock Steven's house in the ORAS demo?

Question

As seen in Munchingorange's video (and others I think) Steven's house is unlockable in the demo. How?

Answer 1

It happens after 15 days of downloading the code by a secret mission.

After 15 days there are some changes to NPC dialogue in the Cities as well.
You can also receive the Nugget Mission.
Souce : Myself and This

Comments

You're being pathetic over points again. His answer included better information and if you're going to refuse to remove a flag that was added out of jealousy then you're going to make it worse for yourself.

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Even I was experienced the same but instead of silver it was sir dan who stole my best answer.

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I removed flag. The other flag I don't know who it was.

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Urgh... *sigh* Are you still not over that already? I said I was sorry even though technically it wasn't my fault, it's not like I told that user to select my answer as best.

You should just get over it already, you think your the only one that has had best answer "stolen" from you? No! Almost every common user on the site (including myself) has had the same thing happen to them at one point or another, you're not an exception

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Are you supposed to get secret mission on first mission? Is the secret one where you battle Team Aqua and Magma people together w/ May? I got that on my first mission, is it different, or is that it where you catch the Mega?

Answer 2

After 15 days, it has a slim chance of unlocking it by a Secret Mission.
Source