| October · 4 sales · median $1 · −42% vs Sep |
| 23 | TCGplayer | Tentacool #125 Near Mint English | −32% | $0.34 |
| 20 | TCGplayer | Tentacool #125 Near Mint English | −82% | $0.50 |
| 14 | eBay | Pokemon Card Tentacool Legends Awakened Common 125/146 NM | +66% | outlier$2.84 |
| 7 | eBay | Tentacool 125/146 LA Legends Awakened Common 2008 Pokemon Atsuko Nishida NM 125/146 | −66% | $1.71 |
| September · 3 sales · median $2 · +202% vs Aug |
| 14 | TCGplayer | Tentacool #125 Near Mint English | +1563% | outlier$4.99 |
| 11 | TCGplayer | Tentacool #125 Near Mint English | −84% | $0.30 |
| 7 | eBay | Tentacool Legends Awakened 125/146 LP Pokemon 125/146 | +311% | $1.89 |
| August · 2 sales · median $1 · +10% vs Jul |
| 21 | TCGplayer | Tentacool #125 Near Mint English | −42% | $0.46 |
| 10 | TCGplayer | Tentacool #125 Near Mint English | +27% | $0.79 |
| July · 6 sales · median $1 · +14% vs Jun |
| 28 | TCGplayer | Tentacool #125 Near Mint English | +19% | $0.62 |
| 23 | TCGplayer | Tentacool #125 Near Mint English | −67% | $0.52 |
| 19 | eBay | Pokemon TCG Tentacool 125/146 Legends Awakened NM | +128% | $1.57 |
| 18 | TCGplayer | Tentacool #125 Near Mint English | +73% | $0.69 |
| 17 | TCGplayer | Tentacool #125 Near Mint English | +43% | $0.40 |
| 6 | TCGplayer | Tentacool #125 Near Mint English | −63% | $0.28 |
| June · 6 sales · median $1 · +25% vs May |
| 30 | TCGplayer | Tentacool #125 Near Mint English | +50% | $0.75 |
| 27 | TCGplayer | Tentacool #125 Near Mint English | +28% | $0.50 |
| 25 | TCGplayer | Tentacool #125 Near Mint English | −22% | $0.39 |
| 17 | TCGplayer | Tentacool #125 Near Mint English | −2% | $0.50 |
| 17 | TCGplayer | Tentacool #125 Near Mint English | +50% | $0.51 |
| 8 | TCGplayer | Tentacool #125 Near Mint English | +42% | $0.34 |
| May · 7 sales · median $0 · −59% vs Apr |
| 31 | TCGplayer | Tentacool #125 Near Mint English | −33% | $0.24 |
| 26 | TCGplayer | Tentacool #125 Near Mint English | −88% | $0.36 |
| 25 | eBay | Pokemon TCG | Tentacool 125/146 | Legends Awakened Common | Lightly Played 125/146 | +782% | $2.91 |
| 24 | TCGplayer | Tentacool #125 Near Mint English | −47% | $0.33 |
| 15 | TCGplayer | Tentacool #125 Near Mint English | +27% | $0.62 |
| 6 | TCGplayer | Tentacool #125 Near Mint English | +23% | $0.49 |
| 3 | TCGplayer | Tentacool #125 Near Mint English | −18% | $0.40 |
| April · 8 sales · median $1 · +17% vs Mar |
| 25 | TCGplayer | Tentacool #125 Near Mint English | −67% | $0.49 |
| 21 | eBay | 2008 Pokemon Diamond & Pearl Legends Awakened Tentacool 125/146 Common Basic MP | +273% | $1.49 |
| 18 | TCGplayer | Tentacool #125 Near Mint English | — | $0.40 |
| 15 | TCGplayer | Tentacool #125 Near Mint English | — | $0.40 |
| 11 | TCGplayer | Tentacool #125 Near Mint English | −72% | $0.40 |
| 2 | eBay | Tentacool 125/146 Pokemon TCG Legends Awakened LP 125/146 | −4% | $1.44 |
| 1 | TCGplayer | Tentacool #125 Near Mint English | −51% | $1.50 |
| 1 | eBay | Tentacool 125/146 Legends Awakened Pokemon Card | +670% | $3.08 |
| March · 4 sales · median $1 · −50% vs Jan |
| 30 | TCGplayer | Tentacool #125 Near Mint English | +14% | $0.40 |
| 22 | TCGplayer | Tentacool #125 Near Mint English | −87% | $0.35 |
| 10 | eBay | Tentacool 125/146 Legends Awakened Pokemon Card | +114% | $2.68 |
| 5 | eBay | Tentacool 125/146 PL - Legends Awakened Pokemon Card - Atsuko Nishida Art | +21% | $1.25 |
| January · 2 sales · median $2 · −17% vs Aug |
| 17 | eBay | Pokemon Legends Awakened Common Card - Tentacool 125/146 | −54% | $1.03 |
| 3 | eBay | Pokemon Tentacool Legends Awakened 125/146 Light Play LP+ or Better 125/146 | +15% | $2.25 |
| August 2025 · 2 sales · median $2 · +59% vs Jul |
| 8 | eBay | Pokémon Tentacool 125/146 LA Legends Awakened LP/NM | −2% | $1.95 |
| 5 | eBay | 1x Tentacool - 125/146 - Common Legends Awakened Pokemon Near Mint #125 | +60% | $1.99 |
| July 2025 · 1 sale · median $1 · −50% vs Apr |
| 23 | eBay | Tentacool - Legends Awakened 125/146 - Pokemon TCG - LP 125/146 | −50% | $1.24 |
| April 2025 · 1 sale · median $2 · −14% vs Mar |
| 28 | eBay | Tentacool 125/146 Legends Awakened LP/EX Pokemon Card | −14% | $2.49 |
| March 2025 · 1 sale · median $3 · +192% vs Jan |
| 15 | eBay | Pokemon Card - Legends Awakened 125/146 - TENTACOOL Lv.16 (common) - NM | +192% | $2.89 |
| January 2025 · 1 sale · median $1 · −44% vs Nov |
| 12 | eBay | Pokemon Legends Awakened Common Card - Tentacool 125/146 | −44% | $0.99 |
| November 2024 · 1 sale · median $2 · −7% vs Mar |
| 7 | eBay | Tentacool - 125/146 - Common NM, English Pokemon Legends Awakened | −7% | $1.77 |
| March 2024 · 1 sale · median $2 · −19% vs Jan |
| 17 | eBay | Tentacool LV.16 Legends Awakened NM, 125/146 Pokemon Card. | −39% | $1.91 |
| January 2024 · 2 sales · median $2 · +139% vs Aug |
| 13 | eBay | Tentacool 125/146 Common Pokemon Card (Legends Awakened) | +96% | $3.14 |
| 2 | eBay | Tentacool 125/146 Common | Legends Awakened | Pokemon Card | +62% | $1.60 |
| August 2022 · 1 sale · median $1 · −51% vs Jun |
| 21 | eBay | Pokemon Tentacool 125/146 D&P Legends Awakened Holofoil Rare LP/NM 5/97 | −51% | $0.99 |
| June 2022 · 1 sale · median $2 |
| 21 | eBay | Tentacool Legends Awakened 125/146 Common HOLO Pokemon Card TCG CCG Nintendo | — | $2.00 |