i dont know lol
No.
you don't use wifi to get the oaks letter.anyhow that's goes to get shamin. ONLY Pokemon PEARL/DIAMOND can get shamin.so how to get the oaks letter? you have to beat the elite four.then you fly to the Pokemon league go down the watterfall.NOTE! you only can get the oaks letter from pearl or diamond versions.go on Google.com to get through.! note you have to have the national pokedex.at the end you will see professer oak talk to him after that go to Google.com to find out more!!!!!!!!!! cheres
Canabl
By action replay or events that that come rarely
You don't
you have to listen to prof. oaks radio show and he will say there are a bunch of murkrow at a certain route
its an item you bring to that rout east of the league to ge shaymin fljkfdljkfljkfdlk;dslk;lfdlkfdslfd
complete the national pokedex and go to canalave city in the pokemart and theres a man by the counter talk and he will give you give you gifts one of them may be oaks letter.
Professor Oaks house is at the bottom of Eterna City. As I should say... Next to the Gym I hope this helped
You have to get it from an event, but there hasn't been any event lately for Pokemon diamond/pearl. Most of the events are for platinum now, oaks letter was given out a feew weeks ago for platinum. You can keep a look out though by going to serebii.net
You can't get it without using action replay. The code is down below 94000130 fcff0000 B21c4d28 00000000 B0000004 00000000 0000aa3c edb88320 2000aa68 00000009 D2000000 00000000
The address of the Fair Oaks Library is: 11601 Fair Oaks Blvd., Fair Oaks, 95628 3749