Professor Oak's New Theory 101/123
Supporter card from HeartGold SoulSilver · released Feb 10, 2010
Professor Oak's New Theory is an Uncommon Supporter card, number 101/123 in HeartGold SoulSilver (released Feb 10, 2010), illustrated by Ken Sugimori. Its TCGplayer market price was ~$6.99 for the reverse holofoil finish on Oct 30, 2026. Between Oct 1 and Oct 30, 2026, its Reverse Holofoil TCGplayer market price was about the same, near ~$6.99.
Prices by finish
| Finish | PriceMarket price | Low | Mid | Buy |
|---|---|---|---|---|
| Normal | ~$0.71 | ~$0.25 | ~$0.71 | CardNexuseBayBuy Normal on TCGplayer (opens in a new tab)Search eBaySearch AmazonCardNexus |
| Reverse Holofoil | ~$6.99 | ~$4.00 | ~$14.08 | CardNexuseBayBuy Reverse Holofoil on TCGplayer (opens in a new tab)Search eBaySearch AmazonCardNexus |
TCGplayer market prices per finish, as of Oct 30, 2026. A guide, not an appraisal; condition and grading change real-world value. Buy links are affiliate links.
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Sealed HeartGold SoulSilver products
TCGplayer market prices (via TCGCSV), Oct 30, 2026.
Card details
| Set | HeartGold SoulSilver |
| Number | 101/123 |
| Rarity | Uncommon |
| HP | 0 |
| Artist | Ken Sugimori |
| Format legality | Not legal in Standard or Expanded |
| Finishes | Normal · Reverse Holofoil |
What the codes mean
- Card number101/123Card 101 of the 123 in the main HeartGold SoulSilver list.
- Set symbol
The small HeartGold SoulSilver symbol identifies the set. Cards from before Scarlet & Violet print a symbol instead of a set code. - Regulation markNo regulation mark. Cards before Sword & Shield (2020) have none.
- RarityUncommon: a black diamond.
- Illustrator“Illus. Ken Sugimori” names the artist who made the art.
Card text
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. Then, draw 6 cards.
Retreat cost: 0
Other Professor Oak's New Theory printings
More HeartGold SoulSilver cards
HeartGold SoulSilver price list
Card data via TCGdex and pokemontcg.io, updated Oct 31, 2026. Prices: TCGplayer market prices via TCGCSV, Oct 30, 2026.