If you mean FireRed, here's how.
First you have to beat the elite four, then you go to Mt. Ember which is on one island, and moltress is at the top.
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You can't find him in the mansion. He's found at the top of Mt.Ember on First Island.
Moltres
Moltres is found at the top of Mt. Ember in Island #1 Jean
moltres
may be moltres
Moltres Charizard Arcanine Ninetales Rapidash Flareon
Moltres is a legendary fire bird on Pokemon
moltres is in leaf green and fire red not emerald.
Moltres is in Mt. Mortar
you get moltres in Pokemon fire red
Moltres
Moltres is resistant to Fire moves, you should try using Rock, Water or Electric moves against it.
In Firered, Moltres is on Mt. Ember, at the very top.
Moltres is NOT in a cave. It is on top of mount ember.
Moltres is found at the top of Mt. Ember in Island #1 Jean
Moltres is a legendary Pokemon from the first generation of games. It is a Fire and Flying type and can be encountered in Pokemon FireRed in Mt. Ember.
moltres
You have to put him to sleep first