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How do I clean it

You may just so happen to select the card you're trying to pick, but that's merely down to luck as said card has the same 20% chance of landing on the spot it was in originally

15+ Pokmon ex

Either way, there is a bonus involved

With all the prepared Pokemon cards laid out face up, prepare the number of energy cards required for the "attack that requires the most energy" among the attacks each Pokemon has, and place them stacked under the Pokemon card so that the number of energy cards is visible

That would be nice, but first you have to play Hoarder's Overflow, then wait several turns with no guarantee that you can even expend 4 that often