You have to talk to the berry masters wife and she'll ask for a good saying then say challenge contest but i think you need to do the elite four to get contest in your vocabular
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Only firered, leafgreen, ruby, sapphire and emerald can get a pamtre berry for firered and leafgreen you can get it from a Pokemon with the ability pickup, in ruby, sapphire and emerald talk to the berry masters wife and tell her "challenge contest" she will be impressed and give you a pamtre berry.
You must obtain the berry first. And plant them as normal as any other berry.
Its a berry given by Scott in Pokemon emerald.
You have to go to the berry masters wife. She asks you if you've heard any sayings lately, and if you want a Pamtre Berry, you answer, CHALLENGE CONTEST. And that's it ;]
Only on the Mirrage Island