Doing this at instant speed before your turn is advantageous by hopefully gassing up your hand, plus you can go deep with graveyard synergies
Psychic Set #38 Art by Shin Nagasawa View card details Rank #5 Olivia Ultra Rare #111 $16.78 TCGplayer Ranked #5 in the set, trading at roughly 29% of the top card's price
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You obviously wont want to proliferate your own battles since you want to remove them as quickly as possible, but you can always proliferate your opponents battles to drag them out as much as possible
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Its power lets it swap into the active spot whenever it wants, and then slap an opponents ex Pokemon for 180 damage with just two energy