Like most Pokmon cards, the value of Psyduck depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Detective Pikachu)
When you are playing either of these cards you probably want both
Cards in mint or near-mint condition (no scratches, bends, or other damage) can be worth way more than the same card in a poorer condition
The spirits all saw through Tatsunari's selfish motivations
P-029 Agunimon P-030 Lobomon Although these cards were intended to strengthen Hybrid decks, they can be easily Digivolved into AncientGreymon and AncientGarurumon rather than using gimmicks that require two cards, such as BT17-011 Agunimon and BT17-022 Lobomon, making it possible to steadily produce excessive speed
Pokmon Japanese Base Set (Expansion Pack, 1996) Complete 102/102 Original Set Authentic Vintage Cards from Japan