Sylveons broad fanbase and Espeons long-standing popularity keep both in steady demand, which is why they tend to sit just below Umbreon in how actively collectors pursue them
In the Magnezone and Darkrai ex deck, the Volt Charge ability from the Stage 1 Magneton card allows the card to juice up on Electric energy without setting the deck to generate both darkness and lightning energy
It also has a bullseye on it, drawing out removal like Path to Exile, giving Marit Lage more chance to shine
Ain is not playable anymore after the RP Law ban, and I only see Douglas Bullet being run as a 1 off sometimes, but not a meta staple
Dragon-types are typically very powerful and have high HP, plus many are Legendary Pokmon
"On the Neo era cards, you really see a lot more of the holo scratches than any previous WOTC era," noted Pratte