Blastoise

Blastoise (137/135), the Secret Rare from Plasma Storm, has an estimated ungraded market price of about $400–$530. Note: 14 other cards named Blastoise exist across the sets Riffle tracks, at very different values; check the collector number.

This page covers Blastoise (137/135), the Secret Rare (about $400–$530) from Plasma Storm.

The other versions: #4/165 from Expedition Base Set (Rare, about $430–$560); #2/102 from Base Set (Rare, about $200–$260); #36/165 from Expedition Base Set (Rare, about $145–$185); #37/165 from Expedition Base Set (Rare, about $140–$185); #2/130 from Base Set 2 (Rare, about $130–$170); #14/100 from Crystal Guardians (Rare, about $110–$150); #2/132 from Secret Wonders (Rare Holo, about $85–$110); #13/95 from Unleashed (Rare, about $50–$70); #2/127 from Platinum (Rare Holo, about $41–$55); #25/181 from Team Up (Rare, about $22–$29); #31/149 from Boundaries Crossed (Rare, about $20–$26); #CC001/25 from Celebrations Classic Collection (Classic Collection, about $19–$25); #16/101 from Plasma Blast (Rare, about $18–$24); #017/78 from Pokémon GO (Holo Rare, about $2–$4).

The collector number printed at the bottom of the card is the reliable way to tell them apart.