Dialga

Dialga (121/185), the Holo Rare from Vivid Voltage, has an estimated ungraded market price of about $0.40. Note: 14 other cards named Dialga exist across the sets Riffle tracks, at very different values; check the collector number.

This page covers Dialga (121/185), the Holo Rare (about under $1) from Vivid Voltage.

The other versions: #SL2/95 from Call of Legends (Holo Rare, about $310–$410); #105/106 from Great Encounters (Rare Holo LV.X, about $210–$280); #4/100 from Majestic Dawn (Rare Holo, about $42–$55); #1/130 from Diamond & Pearl (Rare Holo, about $37–$49); #3/95 from Call of Legends (Holo Rare, about $31–$40); #6/127 from Platinum (Holo Rare, about $20–$27); #5/127 from Platinum (Holo Rare, about $16–$21); #23/127 from Platinum (Rare, about $3–$4); #16/106 from Great Encounters (Rare, about $2–$3); #127/214 from Lost Thunder (Rare, about $2–$3); #20/25 from Celebrations (Rare, about under $1); #112/203 from Evolving Skies (Holo Rare, about under $1); #095/132 from Mega Evolution (Rare, about under $1); #135/191 from Surging Sparks (Rare, about under $1).

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

It's roughly a wash: with a 45% PSA 10 gem rate and current graded prices, grading a near-mint Dialga (121/185) is estimated to come out within about $10 of selling it raw (est.); grade for protection or display, not profit.

Assumes ~$25/card bulk-rate grading (standard service costs more); ignores turnaround time, sub-9 grades, and shipping. A screen, not a promise.

Dialga (121/185) is a Holo Rare. PSA has graded 177 copies to date, so graded supply is measurable and growing.

Of the 177 copies PSA has graded, 45% earned a PSA 10. That's a fairly typical gem rate for a modern card. Grade-by-grade population and pop-over-time appear with Riffle premium.