how rare is a gx pokemon card Charizard-GX | Burning Shadows [Fighting]×2 A Holographic History Of The

This will cause some players to spend money to maintain that initial sense of progression or gamble at pulling their favorite card

The opponent will have to start playing more Pokmon so that they don't lose to having none in play

To answer your second question, for a long time there were only a few companies grading Pokemon cards on a large scale, which were PSA, Beckett and GMA (and the now defunct MAP grading)

Someone probably saw the post by KEI (or nine on the new forum I guess) and added it to Bulbapedia

Level Limit Area B allows you to put all of your opponents bigger monsters in a weaker position, meaning you can play your own XYZ monsters and get rid of those threats