One thing I can say thats consistent across the board is that we always place importance on whether or not the person likes Pokemon, or has interest in Pokemon, and other than that its just their personality. That way, every player will be able to recognize if a Pokemon has been paired with an attack, HP, or even retreat cost that doesnt necessarily match its nature
The prerelease promo card for the original Pokmon League was a Clefable, from the Jungle set
This included a guaranteed holo card
You can see the detailed linework of the Guidelight Voyagers, the punk edge of the Endriders, and the soft, fantastical style of the Alacrian Quickbeasts
I taped the foil part of electrodes card to the background of Charmander and made myself a foil Charmander to display in my little phone case window
Theyre very valuable even if you dont use them in your decks, and often useful in another format