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Brock's Rhydon price and historyThe live card page: price, chart and graded ladder.All Gym Heroes pricesEvery card in the set, priced off the same tape.Gym Heroes set reportHow the whole set has moved and what leads it.Cards illustrated by Ken SugimoriEverything this illustrator has drawn, with prices.This week's biggest moversThe widest recorded moves across the catalog.All market reportsEvery card and set we publish a dossier on.How our calls scoredThe public ledger of every call, win or lose.Every Pokémon setThe full set index, oldest to newest.

What stands out

PSA population larger than 95% of Gym Heroes.

Reference class: its set (Gym Heroes). Percentiles are recomputed nightly, by disclosed rule, from recorded data across every tracked card.

01The verdict block5 readings

What the fixed formulas say about the figures below, with the arithmetic shown.

Assay

Supportive1Caution1Context2Neutral1

Each stamp is one fixed formula applied identically to every card. Supportive and caution mark a reading that cuts the same way for anyone holding the card. Context marks a fact that is good news to a buyer and bad news to a holder, so the desk does not pick a side.

LiquidityCaution

FROZEN

Verified sales a week at PSA 10, from the daily graded tape.

Registry inflowContext

STEADY INFLOW

New slabs a week against the recorded PSA population.

Market floatContext

HEAVY LISTED FLOAT

Active raw listings divided by the PSA population.

Gem-rate driftNeutral

DRIFT NEUTRAL

The recent gem share against the rate at the window start.

Character demandSupportive

CHARACTER BID

Every verdict is a disclosed formula over recorded data, applied with the same fixed thresholds to every card. No discretionary price forecasting is used, and the arithmetic is printed so it can be reproduced.

moonstone Pro

The full Brock's Rhydon dossier is sealed

Pro breaks the seal on our call: a stamped buy, hold, or sell and a 180-day target price on every rated card, each a disclosed formula over recorded data. Below is every section this dossier is holding back.

What this dossier is holding6 sealed sections

02
The call
The rating was refused on this card 2026-09-28 and the refusal states its reason; members read why in full.
03
The tape · verified sold medians
16 grades carry a verified sold median on this card, each with its sample size. Comps through 2026-09-28.
04
The registry
9 daily PSA population snapshots on file, 49 days of continuous history, drawn as a growth curve.
05
Sales velocity

Brock's Rhydon Gym Heroes Market Report