You cannot get the Master ball back if you missed it at Team Aqua's Base. The base is blocked forever.
The only way is to win the lotto at Lilycove City by matching all the numbers. Then you will receive a Master Ball.
Chat with our AI personalities
in team aquas hide out
give a Pokemon the masterball and put it in the daycare with a ditto then it will be cloned!!!!!!
Well, if you don't have a masterball, use one... but you can catch one with an ultraball. My friend did. I ran out of them!
probably action replay but you can just buy a firered leafgreen sapphire or ruby and just save the masterball you get from them and give them to one of your Pokemon and migrate it
you can not get master ball in Pokemon emerald exsept in lotto in the big shop and in the agua cave. PS you can use a code