Like most Pokmon cards, the value of Fletchinder 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 (Stellar Crown)
By manipulating the discard pile with its Hallow Exchange-Dusknoir decides which Pokmon that will be revived and which will be sacrificed to the shadows
It is much easier to appraise the value of a Pokemon card compared to appraising a baseball card for example
Mime Scyther Jynx Electabuzz Magmar Pinsir Tauros Magikarp Gyarados Lapras Ditto Eevee, Vaporeon, Jolteon, and Flareon Porygon Omanyte and Omastar Kbuto and Kabutops Aerodactyl Snorlax Articuno Zapdos Moltres Dratini, Dragonair, and Dragonite Mewtwo Mew The Pokemon TCG Scarlet & Violet Scarlet & Violet 151 set will also feature some special ex cards
The price is a bit lower than Gamegenic and BGS, but they tends to get very cloudy and dusty with time
EX The green genie grew into a big radioactive chicken