Like most Pokmon cards, the value of Yanmega depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (POP Series 8)
However, the frontside is the powerful one
(Note: there are Pokmon with the same name that have different attacks and abilities listed underneath them
Its unclear how many Holofoil variants Topsun printed, although collectors have documented up to 16 variations, including: Mewtwo / Venusaur Zapdos / Aerodactyl Jigglypuff / Eevee Venusaur / Electabuzz Clefairy / Horsea Farfetchd / Hitmonchan Meowth / Cubone Vulpix / Hypno Dragonite / Mr
This allows us to offer them in our store in advance so that you can be one of the first to get your favorite new items
As they are all creatures, and lack rules text, their function remains largely understandable even to players who are unable to read them