I used a Blastoise that knew Hydro Cannon and a Flareon, and 50 ultra balls (I ended up only using 4 of them) First, the most important thing to do....Get to Moltres and SAVE! After that, engage it into battle. Use Hydro Cannon on Moltres and hope Moltres uses Endure. If not, reset the game by pressing A+B+Start+Select until it uses Endure. It should only have one health left. If you have a Pokemon that can paralyze it then use it. After that, switch to a Pokemon that has the ability Flash Fire. (Moltres only know 2 attack moves and they are both fire, so it can't defeat it) I suggest Flareon. After doing all that, throw ultra balls until Moltres is caught.
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Moltres is not in ruby only firered, leafgreen and Pokemon xd gale of darkness can get moltres.
mewtow zapdos moltres articuno mew entei raikou suicune
Moltres, zapados, and articuno are the three main legendaries in leaf green/fire red
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.
Its impossible. The only way to get a moltres is to get it in pokemon leafgreen or firered and catch it on island 2 (I think). Then you beat both games (beat elite 4) and finish pokedex in pokemon firered/leafgreen. Once you did that, you have to trade moltres into emrald. You can only do this with gameboy SP's and regular gameboys, and you need a wireless connecter (or with wires, doesnt matter). thats the only possible way to get moltres in pokemon emrald. Hope it helps!!