The article asks illustrator Atsushi Furusawa about his philosophies and processes for drawing Arcanine from 151 (#59)
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It also allowed a lot of room for flavor text
In essence, all of these Pokmon treasures practically require a Master Ball to obtain
The ones that do usually develop strategies around it, like white and black, and these are the easiest and most effective ways to enable lifelink for other colors, or to pursue a dedicated lifegain strategy
At the time, original editions of cards were printed with black borders, while reprints had white ones to differentiate them