Professor Oak's New Theory appears in HeartGold & SoulSilver, released in 2010. Its card type is Trainer.
The rarity label is Uncommon. Card subtype classification is Supporter.
The card text reads: You can play only one Supporter card each turn. When you play this card, put it next to your Active Pokémon.
When your turn ends, discard this card. Shuffle your hand into your deck.
Professor Oak's New Theory from HeartGold & SoulSilver is currently trading around $0.75. Week-over-week change is limited (0.0%), indicating short-term stability.
Current pricing is broadly aligned with its 30-day average ($0.75). Across the past 90 days, tracked prices have stayed near $0.75 with minimal dispersion.
The listed rarity for this print is Uncommon.
Collector-focused market read: The latest week is near flat (0.0%), suggesting consolidation rather than breakout behavior. With a 0% 90-day spread ($0.75-$0.75), this card currently tracks as low-volatility.
Current value remains close to its 30-day mean ($0.75). The clearest graded reference is PSA 9 at $25.00, or +3233% relative to raw.
HeartGold & SoulSilver entered circulation in 2010. HeartGold & SoulSilver is grouped under the HeartGold & SoulSilver era.
The checklist contains 124 cards, placing it in a mid-size expansion range. As of 2026, the set is 16 years old and fits a legacy-era profile.
In the HeartGold & SoulSilver checklist, Professor Oak's New Theory occupies position #101 as a Uncommon card.
Collectors tracking Professor Oak's New Theory often benchmark it against other Professor cards. This comparison sample includes 1 alternatives across 1 set.
Only one priced comparison is available in this sample ($0.95). Notable alternatives include Professor Oak's New Theory #83 (Call of Legends) at $0.95.
