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Dual Pump can let them hurt 2 enemies at once, which is an ideal tactic for if the opposing active pokemon is low on HP and Volcanion's trainer wishes to start chipping away at incoming threats sooner

This Soul Sister enchantment might have an argument for being better than Authority of the Consuls, since you can plan to play into it with your own creatures, but I think the stax effects from the Kaladesh rare might outclass it

Even if the opponent has no Supporter cards to shuffle back into their deck, they are still giving away valuable information

The first Pokmon card they captured was a Venusaur from the Base set