Gardevoir ex could be tough, but is generally neutral / favorable in the prize trade unless your opponent ruins your setup with Unfair Stamp [Twilight Masquerade] or a well-timed Iono [Paldea Evolved]
Buy, sell, and trade Pokemon Japanese Old Maid cards on the Double Holo marketplace
For example, there are cards that, despite being heavily skewed toward defensive use, contribute significantly to win rates due to their high power level, making them well worth including even in aggressive decks (a prime example being Force of Negation, a counterspell that is difficult to use aggressively)
Subsequently, after the first few turns, Exploration can quickly become useless, as you only have so much land to play
Finally, the two more specific cards that caught my eye
for Nintendo 3DS/Wii U Kyogre returns as a Pok Ball summon with faster movement as well as a longer time and more KO ability