You first needed to get it from mystery gift. If you didn't, you can't get it anymore. If you already have it, you can go to any Pokemart to pick it up.
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You get oaks letter from a special event that is on the internet or wifi. you get it from any poke-mart in sinnoh
to get professer oaks letter then you must first have the mystery gift from Jubilife city.You must also have the national pokedex. Save your progress.Then turn your Nintendo ds on and select mystery gift.Then you must select via wi-fi connection and choose oaks letter. then you must play Pokemon diamond and go to any poke-mart and talk to the man in green and he will give you oaks letter. ----------------------------------------------------------------------------------------------------------------- Can u do it any time, or do u have to do it by a certain time?
in the poke mart
Eon ticket is only available in Nintendo events not in poke mart
Poke-mart.