The Lost Thunder cards most worth grading are Lugia-GX Secret Rare, Mimikyu-GX Secret Rare and Lugia-GX Rainbow Rare. Lugia-GX Full Art, Tyranitar-GX Secret Rare and Professor Elm's Lecture Full Art also qualify on raw value.
Lost Thunder is a Sun and Moon expansion that launched November 2, 2018 with over 210 cards, according to The Pokemon Company International. The same announcement lists 13 Pokemon-GX, more than 20 Trainers, and names such as Lugia-GX, Tyranitar-GX and Prism Star Celebi and Ditto. Grading means a professional service authenticates a card and scores its physical condition.
Table of Contents
- Highest-value secrets and full arts
- Do rainbow rares make the cut?
- What condition justifies submission?
- When does cost rule out grading?
Highest-value secrets and full arts
The CBR price tracker puts Lugia-GX Secret Rare at about $175, with market price near $221.06, making it the set's lead candidate for grading (CBR price tracker). Mimikyu-GX Secret Rare follows at about $165.
The next tier includes Professor Elm's Lecture Full Art near $90, Lugia-GX Full Art near $81.75 and Tyranitar-GX Secret Rare near $75. The same CBR price tracker identifies those levels. Professor Elm's Lecture matters because it is a Trainer, not a Pokemon-GX.
Do rainbow rares make the cut?
Bleeding Cool's rainbow-card breakdown prices Lugia-GX Rainbow Rare at about $143.55 (rainbow-card breakdown). That is more than double Suicune-GX Rainbow Rare at $69.04 and Mimikyu-GX Rainbow Rare at $52.14.
Bleeding Cool calls Lugia the set's true chase card. Submit Lugia Rainbow Rare before other rainbow rares because the value gap is wide.
What condition justifies submission?
Cardrake's grading guide says professional graders score centering, corners, edges and surface. It puts PSA 10 at about 55/45 centering or better on the front and 75/25 or better on the back. Cardrake's grading guide recommends a simple value filter (grading guide).
Use it as a cutoff before you inspect condition. Check centering first, then look at corners, edges and surface under bright light. Send only cards that look clean across all four areas.
- Grade cards above $50 that look PSA 9-10.
- Consider $20-$50 only with confident PSA 10 potential.
- Generally skip cards under $20.
When does cost rule out grading?
Pokemon Price Tracker reports PSA paused Value tiers June 2, 2026 amid an approximately 12-million-card backlog (2026 grading guide). It lists Regular at about $79.99 per card as the cheapest realistic option.
Cardrake's grading guide notes PSA 10 examples commonly sell for roughly 2-10 times raw price and PSA draws the deepest buyer pool. PSA 9 or lower often adds little after fees, so compare raw value against the $79.99 fee before you submit.
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