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To get Moltres in Leafgreen, get a tri-pass or rainbow-pass and go to one island. Then go to Mount Ember, and get to the end. There you will find Moltres.
Ruby is in MT.Ember after beating the ellite four and give it to Celio and he will give u the rainbow pass. Using the rainbow pass go to the six island and u will find it!
cheat
I don't know! so why don't you just not cheat and find out how to pass the level?
It is not possible to obtain the rainbow pass in Pokémon Emerald. It is only available in Pokémon FireRed and LeafGreen.