You should have completed the nat dex. This gives you the chance to get Chicorita, cyndaquil, or totadile. You can only get one. MAKE A GOOD CHOICE :)
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Complete the Unova pokedex (after that coplete the national pokedex)
pokedex or National
Once you have completed the pokedex I think you should try and evolve them all and then get them all to level 100 although its impossible to complete the pokedex without an action replay
If you complete the national pokedex, go to visit Prof. Oak and he will give you a ticket to a place called foggy valley. You have to get a ticket because it is also an island.
You are a Pokemon master.