There used to be official Psypoke trainer cards up until around 2008. sN0wBaLL made them and they were neat since you could get ribbons for participating or placing in community activities.
I toyed with bringing back official trainer cards a couple years ago using the XY card style and Gen VI trainer sprites but I didn't think it would catch on so I shelved it.
Here are a couple of test cards. I don't know why I used Dare234 for an example lol.
Here's an example of an old card for comparison
And what it all comes down to
is that everything's gonna be quite alright