Thanks very much, nick15, for translating all of those details! That's some impressive work!
The website, and all the details that nick15 provided say October 4th, not 6th. This is a good example of bulbapedia not always being a super-reliable source. Not that this site is without mistakes, but bulbapedia tends to make quite a few more in their news reporting.
On a related note, a lot of the users who update bulbapedia's event info just get a lot of that info from this site.
You do know that this event has happened once before already, in Japan, right? But with the difference being that they were eggs in the Japan event.
With six chances to get six pokemon, there are going to be a total of 36 Wonder Cards for this event.
It's very likely that the only difference of the WCs of the same pokemon over the six weeks will be the WC ID, though.
For those who want to help contribute Wonder Cards for the Gallery, it's possible to grab more than one WC per week on a single game if you have access to a means of managing your sav files (Such as: USB save file manager for retail carts, ROM backup on a flashcart, or emulator that is set up to access the wifi connection)
Here's what you can do:
Make a backup of your sav file before getting any WCs Download a Wonder Card from the Wifi Connection
Extract that sav file and store it somewhere
Restore original sav file with no WCs into your game
Download another Wonder Card from the Wifi Connection
Rinse, Repeat, until you have all six for the week
A big thanks ahead of time to anyone willing to help out with the legwork in obtaining these all for the Gallery and collection!
And thanks again to nick15 for all the details.