Its best to control things and make sure it happens
Instead, Colorless-type Pokmon fuel their attacks with any Basic Energy card (like Darkness, Grass, Lightning, etc.)
Fossil was a definitive set focusing on Pokmon with much older lore that somehow gave the Pokmon universe an intriguing depth
Illuminate lets you add one random Pokmon card from your deck to your hand, effectively acting as a more versatile Pok Ball or a Pokmon Communication without a cost
I dont dislike this approach as the theme of the products feels more centred around Shimmering Skies although having cards from different sets can sometime allow to make a deck more rounded
For a while, there was a sacrifice theme in the black-green Squirrel archetype, but you tend to want to use offspring tokens for sacrifice themes