It just depends on Eiichiro Oda and how he wants to tell the story at the time
With Ho-Oh and Lugia as the respective legendaries of the two games, its no real surprise they make an appearance as the card art but Gold and Silver also introduced the idea of baby Pokmon, pre-evolutions to existing favorites
Flavor-wise, in FF4, Golbez commands the Four Fiends (who have THE best theme in Final Fantasy history), which lends itself a little here in how this card works, allowing him to see what's coming while fueling his abilities
Lost Zone cards such as Giratina VSTAR will feature a shadowy aura emanating from the artwork
Unique Cards Index | 1996 World Champion | Shichifukujin Dragon 1996 Two cards will forever frustrate Magic card collectors, as there is only one of each in existence
Is Grenzo, Dungeon Warden part of any infinite combos