Whatever you want you can try the battle frontier train your Pokemon etc.
Chat with our AI personalities
I believe you meet him after completing the Sinnoh Pokedex. Then he will update your pokedex to national.
After completing the Sinnoh Pokedex, go talk to Professor Rowan. He will upgrade your Pokedex to the National Pokedex and give you the Poke Radar.
In the both the Hoenn and national pokedex, Pokemon number 367 is Huntail.
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once you have completed the pokedex, i am pretty sure you talk to one of the prof.[oak or alm] and they give you a gift.[mabye national dex]