As someone with an already large collection of physical Pokmon cards, I have a hard time rationalizing buying more virtual ones for a mediocre online version of the game I already play in the real world.
First, the top 10 of the set's subset, the Classic Collection

Other printings of Kingler $39.01 Kingler Expedition Base Set $5.20 Kingler Expedition Base Set $1.85 Kingler FireRed & LeafGreen $0.41 Kingler Unbroken Bonds $2.30 Kingler Fossil $0.36 Kingler Phantom Forces $0.13 Kingler Sword & Shield $0.11 Kingler 151 Most valuable cards in Great Encounters View the full price guide $87.00 Palkia LV.X Great Encounters $86.07 Dialga LV.X Great Encounters $62.03 Darkrai LV.X Great Encounters $31.70 Cresselia LV.X Great Encounters $18.14 Darkrai Great Encounters $17.71 Swampert Great Encounters $14.94 Togekiss Great Encounters $14.74 Blaziken Great Encounters More cards by Mitsuhiro Arita $1,124.50 Celebi Skyridge $630.99 Umbreon Aquapolis $493.33 Umbreon Aquapolis $457.99 Charizard Base Set $457.54 Gengar ex FireRed & LeafGreen $389.99 Charizard Legendary Collection $359.99 Golem Skyridge $325.24 Team Rocket's Mewtwo ex Ascended Heroes Water typeWater type Pokmon cards SetGreat Encounters Most valuableTop 100 Pokmon cards You might also like...

This is a Jumbo/Oversized Pokemon Card featuring Dubwool V
Not being affected by special conditions just isn't enough to prop it up
Snorlax, Garchomp Ex, Leafeon Ex, Crobat, Raichu, Carnivine, Irida, Barry, and then Pokemon TCG Pocket 's Arceus Ex itself are all either very valuable now, or at least tend to pop in and out of meta decks consistently