Poliwag

Poliwag (30/149), the Common from Sun & Moon, has an estimated ungraded market price of about $4–$6. Note: 16 other cards named Poliwag exist across the sets Riffle tracks, at very different values; check the collector number.

This page covers Poliwag (30/149), the Common (about $4–$6) from Sun & Moon.

The other versions: #125/165 from Expedition Base Set (Common, about $44–$60); #67/115 from Unseen Forces (Common, about $29–$38); #87/144 from Skyridge (Common, about $16–$21); #75/112 from FireRed & LeafGreen (Common, about $11–$15); #114/146 from Legends Awakened (Common, about $6–$9); #62/75 from Neo Discovery (Common, about $6–$8); #58/95 from Unleashed (Common, about $5–$7); #59/102 from Base Set (Common, about under $1); #37/214 from Unbroken Bonds (Common, about under $1); #15/111 from Furious Fists (Common, about under $1); #23/108 from Evolutions (Common, about under $1); #88/130 from Base Set 2 (Common, about under $1); #36/214 from Unbroken Bonds (Common, about under $1); #060/165 from 151 (Common, about under $1); #041/167 from Twilight Masquerade (Common, about under $1); #030/196 from Lost Origin (Common, about under $1).

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