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Depends if it's the Sinnoh Pokedex and then you get the National Pokedex (after you finish the game) and a whole bunch of other things. But if it's the National Dex, then nothing happens when you complete it. I know because I actually caught every single Pokemon in the National Dex but when I went to talk with Professor Oak, he will just thank you. If you talk to Dawn/Lucas, she/he will congratulate you and Professor Rowan will say there are many more Pokemon in the world. And Dawn/Lucas' stupid little sister of a retard is still telling you to hurry up and out do Dawn/Lucas.

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13y ago

What else can I help you with?