OK! So the person above was correct! I will explain in a longer way and a easy way!
1. So this is the short version= Did you get all your Gym Badges? This could be another activity to do, also Barboa (the pokemon safri man) has he called? Or maybe you could catch more pokemon, and battle more people! - Done!
2. Longer version= Obviously, you go back to Professor Elm, at his office or science lab I could call it, is in your home time, next to your house. Then he will talk to you about "congrats, you did good kiddo" something like that. OF course he will talk to you about the Pokemon League! Here is the tricky part, he says something about Route 26 and Route 27..But where is it??! You can look on the map for it, and it will not be there. So walk over to your house, after talking to Professor Elm, but do not go into your house. Keep walking, untill you see a lake, on the right side of your house. Teach your pokemon 'Surf' to cross the lake, and you will reach a small piece of land. You will see a Man/kid talk to him, and he gives you some sort of advice. After that you see a cave? On the small piece of land? That is where you need to go into! Make sure one of your pokemon know the action 'Waterfall'. Inside of the cave! Try getting trough there when using water fall, bolder, and smash, and you should find an exit! I haven't gone farther than the Cave point so good luck! Route 27 or 26 should be after that cave!
Recommend me! All you need you do is ask me about pokemon! Just say, when asking another question Vivi: .....(question) and I will answer right away!
Thank you all for reading this! You will see a signature after every thing I answer! NO COPYRIGHTING! I HAVE ALL RIGHTS!
Thx AGAIN! - Vivi :D xD :P