there is not a wonder mail code there are no Pokemon regular that are level 100
Sky mail is completely independent. It helps you with your email and USPS is a whole different company. They might talk but they are two different companies.
Direct point sequence mail, that reaches the post office presorted, its different from regular mail that the postman sorts. Is carried separately as well.
sky uses wonder mail "s"
No. Sky Mail is not available in all countries. However, it is available world wide and some Sky Mail providers deliver to over 180 countries and territories.
Yes
regular or irregular
Regular mail is sent from someone and arrives in your mailbox. Examples of deliverers: UPS and FedEX guys, or just your ordinary mail person
The wonder mail from Time and Darkness will not work in sky. The Wonder Mail S will only work in sky. if you want wonder mail s codes read this, Please vist and become a member. You will get unlimted acess to the games greatest codes!
There is a site posted on Google for Wonder Mail S Generators of Explorers Of Sky.
Just go to UPokeCenter.com and find the wonder mail generator. for red and blue it is regular mystery dungeon, for darkness, time, and sky it's mystery dungeon 2
There is a wonder mail generator for explorers of sky here is the Link : http://apointlessplace.net/wms/wmgenerate.html