Firstly, go to the weather institute near Fortree city. Then talk to the scientist on the near the computer and he will tell that it's rainy in Route ... Or that it is extremely hot in Route ... When he says hot, it will be Groudon. Just search for a cave that you've never seen before, and go to Groudon who will be awaiting you after you are in the middle of the cave. Note: When there's a text with: The rain faded away, or something like that, it means you just have to go back to the weather institution to hear where the legendary Pokémon is now.
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you can use master ball in caught the groudon
The three legendary Pokemon in Pokemon emerald is Kyorge, Groundon and Rayquazer.
yes you do from Nathan mcphetres
Yes, You can catch Groudon in Pokemon Emerald.
You can't catch one in Pokemon Emerald.