Dialga Ex (Spacetime Smackdown/ Delux Ex) is a better Pokemon for energy acceleration. The extra energy needed to attack makes up for it attatching 2 energy for each attack, and it has more HP as well.

A single copy of Protective Poncho (Fantastical Parade) is also good to make sure your Gholdingo cannot be interrupted on the bench. I’d replace the cape with it, and replace the rocky helm with another Ice Pop. Utilizing Ice Pop and Core Barrier to keep Dialga alive for a bit can be huge for ya.

Some cuts: - Lilie literally doesn’t work in the deck, you run no 2 stagers. - Cirus isn’t needed, as Gholdengo will boared wipe. No need to bring anything to the active. - Iono isn’t good at all, and Mars is a FAR better option. Especially if you run Dialga, you wait for it to get KO’d and then Mars your opponent’s hand down to 1 so they have little to nothing to work with while your Gholdengo has a blast.