Brock's Onix (21)
Pokémon · Gym Heroes · Rare · 021/132
Released 2000-10-14
$5.52
30-day forecast: $5.52
Live Pokémon price tracking, buyout detection, and price predictions for Brock's Onix (21) on TCG Collector Tools.
Prices Across Marketplaces
TCGplayer (market)
$5.52
TCGplayer (mid)
$8.59
TCGplayer (low)
$5.52
Price Forecast
| Horizon | Forecast | vs Today |
|---|---|---|
| 7 days (stable) | $5.52 | +0.0% |
| 30 days (stable) | $5.52 | +0.0% |
| 90 days | $5.68 | +2.9% |
| 180 days | $5.68 | +2.9% |
| 1 year | $5.68 | +2.9% |
Confidence 56% · Calibrated 30-day range $4.65–$6.39 · vintage card · veryLow volatility
Our Forecast Track Record
What we predicted for this card, and what actually happened. We publish misses as well as hits. Anchored 2026-04-26 · at $5.00 · 94 days ago.
| Horizon | We predicted | Actual | Error |
|---|---|---|---|
| Day 7 | $5.01 | $5.00 | -0.2% |
| Day 30 | $5.06 | $6.11 | +20.8% |
| Day 90 | $5.18 | $5.52 | +6.6% |
Signal Analysis
HOLD
Conviction 50/100 · Target $5.52 · Range $4.97–$6.07 · over 30d
Mixed signals. Monitor for clearer direction.
Recent Price History
$5.52
$5.52
$5.52
$5.52
$5.52
$5.52
$5.52
Frequently Asked Questions
How much is Brock's Onix (21) worth?
Brock's Onix (21) is currently $5.52 on TCGplayer for the Gym Heroes printing. Prices update daily from live marketplace data.
Is Brock's Onix (21) going up or down in price?
Our 30-day forecast for Brock's Onix (21) is $5.52, with a stable trend at 56% confidence.