Inspired by @giselle’s recently completed Team Rocket binder page, I feel like these four would be a nice quartet together as well. 
Greetz,
Quuador
Put together like this, the fourth card feels like an intermission in the afterlife, like a stay in Avalon before rebirth. I indeed thought about framing them.
1st ed charizard
shadowless charizard
unlimited charizard
4th print charizard
I’d love to shoot for basic, stage 1, stage 2, and then mega or gigantamax (although tbh, I haven’t found any mega or gigantamax arts of any of the Pokemon I like to be frame-worthy yet haha).
I love this idea! Mega Gardevoir SAR could work for the fourth as well.
V-union cards were actually the first ones that came to my mind which inspired me to answer this set of cards
But ultimately my choice would definitely be this quartet, would really love to admire them all day
but other than that i wanted to post some more unsual choices too that i think would be funny, the first one is only a trio but imagine there being one more!
These are the some that come to mind for me, that I have from my personal collection or would like to have.
I need the leafeon and glaceon from Evo skies to complete the ones from CZ.
I’m not sure I’m too happy with the Darkrai for the look to go with the other 3 buts it’s what I have right now.