Catching Groudon easy
When you go to the underwater base, go on one of the teleporters in the room with around 20 teleporters (you will know it when you see it). There will a room with four pokeballs inside. 2 of these are electrodes and 2 are items. One of these items is a master ball. Keep the master ball until you find Groudon. Use the master ball and there is 100% chance you will catch it. Have fun and I hope this helps.
P.s. Using groudon against the elite four is easier than not using it!
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