Lucario

Lucario (120/185), the Rare from Vivid Voltage, has an estimated ungraded market price of about under $1. Note: 20 other cards named Lucario exist across the sets Riffle tracks, at very different values; check the collector number.

This page covers Lucario (120/185), the Rare (about under $1) from Vivid Voltage.

The other versions: #122/123 from Mysterious Treasures (Rare Holo LV.X, about $100–$135); #6/130 from Diamond & Pearl (Rare Holo, about $50–$70); #80/113 from Legendary Treasures (Rare, about $36–$48); #14/95 from Call of Legends (Rare Holo, about $30–$39); #174/91 from Paldean Fates (Shiny rare, about $29–$38); #77/135 from Plasma Storm (Uncommon, about $24–$31); #78/135 from Plasma Storm (Rare, about $24–$31); #117/236 from Unified Minds (Rare, about $18–$24); #61/146 from Legends Awakened (Uncommon, about $14–$19); #64/99 from Next Destinies (Rare, about $12–$17); #53/127 from Platinum (Uncommon, about $9–$12); #19/95 from Unleashed (Rare, about $6–$8); #63/124 from Fates Collide (Rare, about $4–$6); #67/156 from Ultra Prism (Rare, about $4–$6); #47/124 from Fates Collide (Rare, about $4–$5); #126/214 from Unbroken Bonds (Rare, about $3–$4); #71/147 from Burning Shadows (Rare, about $1–$2); #079/172 from Brilliant Stars (Holo Rare, about under $1); #114/198 from Scarlet & Violet (Uncommon, about under $1); #SV22/94 from Hidden Fates Shiny Vault (Shiny rare).

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