You can get them from going on golden chamber jobs, just normal mail, or certain sites that have the wonder mail passwords.
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go to google and type wonder mail generator and there you have it
I think of not. By by from belium.
You can just go on upokecenter.com and you can make wonder mail codes legitly I did it with golden seeds and by primal dialga, I was at lvl 51
Basically what i do is go onto google, type in "Wondermail codes for the joy seed" and then i click on cheatcc.com link, it has the best cheats for wondermail
you DO NOT need wonder mail. You just need to beat palkia twice and it will ask to join your team.