There are a lot of Espers in the series, after all, so to make them all white/blue/black would be hugely restrictive
Magikarp is the most obvious example, since that was created as a very weak Pokemon that evolves into the much more powerful Gyarados
And with the unseeded packs, youre more likely to strike lucky than you would with the booster box
X while Froslass GL does not have anything to level up to
In comparison to modern eras like Sun & Moon, Diamond & Pearl's top cards (with available prices) can't compete with these modern marvels
You pick which Vanguard card you want to use in a match, with each one coming with unique modifications to rules such as increasing or reducing your maximum hand size, or granting you additional life when the game starts