Its a way for decks to consistently find certain cards, most often combo decks, which means that the cheaper and more efficiently a card can perform these actions, the stronger it is as a tutor
However, the real reason that evoke redefined the role of creature cards so completely wasnt their high floor it was their stratospheric ceiling
2x Staryu 2x Starmie ex 2x Articuno ex (or 2x Lapras ex) 1x Froakie 1x Frogadier 1x Greninja 1x Fossil Card 2x Poke Ball 2x Professors Research 2x Misty 2x Sabrina 1x Giovanni 1x X Speed Given Starmie ex's lack of retreat cost, and the fact it only requires two Energy to do 90 damage, makes them an incredibly powerful Pokemon to use
Chart shows the price of Bonnie #102 at the end of each month going back as long as we have tracked the item.
Repeat this process with some other card in play to draw as many cards as you like
That scarcity has caught up with all the cards from the set, including the promos