| October · 1 sale · median $3 · +118% vs Sep | |||||
| 7 | eBay | 2004 Light Played Pokemon Tentacool 020/083 Undone Seal ADV Japanese Japanese | +118% | $3 | |
| September · 1 sale · median $2 · — vs Aug | |||||
| 27 | eBay | HP/DMG Pokemon Tentacool 020/083 Undone Seal ADV Japanese Unlimited Japanese 020/083 | — | $2 | |
| August · 1 sale · median $2 · −40% vs Jun | |||||
| 18 | eBay | HP Tentacool 020/083 - Undone Seal Japanese - Pokemon Card Japanese 020/083 | −40% | $2 | |
| June · 1 sale · median $3 · −5% vs May | |||||
| 7 | eBay | Tentacool 020/083 ADV Undone Seal Pokemon Japanese Moderately Played Japanese 020/083 | +34% | $3 | |
| May · 2 sales · median $3 · +23% vs Jan | |||||
| 9 | eBay | Pokemon Japanese Tentacool Common Undone Seal 020/083 Near Mint Japanese 020/083 | −45% | $2 | |
| 2 | eBay | Tentacool 020/083 Undone Seal Japanese Pokemon Card TCG Japanese 020/083 | +58% | $4 | |
| January 2025 · 1 sale · median $2 | |||||
| 1 | eBay | Tentacool 20/83 1st ED Undone Seal Japanese Pokemon Card #20 | — | $2 | |