Tests show that its cells closely resemble water molecules, which perhaps explains its ability to conceal its form while submerged. I believe the origins of mermaid folklore lie with this Pokémon.
#12
Jungle1st Edition Holo: $252.99
Unlimited Holo: $59.54
#28
Jungle1st Edition: $43.31
Unlimited: $14.15
#45
Team Rocket1st Edition: $28.25
Unlimited: $7.21
#52
Neo Destiny1st Edition: $97.44
Unlimited: $33.08
#9
Legendary CollectionHolo: $136.98
Reverse Holo: $413.75
#H31
SkyridgeHolo: $423.00
#33
SkyridgeNormal: $96.07
Reverse Holo: $174.99
#25
EX SandstormNormal: $21.24
Reverse Holo: $127.48
#19
EX Unseen ForcesHolo: $129.48
Reverse Holo: $184.99
#18
EX Delta SpeciesHolo: $169.28
Reverse Holo: $199.99
#110
EX Delta SpeciesHolo: $315.24
#6
POP Series 3Holo: $37.68
Normal: $33.61
#102
EX Power KeepersHolo: $1,399.95
#34
Majestic DawnNormal: $15.32
Reverse Holo: $37.49
#34
Rising RivalsNormal: $13.23
Reverse Holo: $36.05
#41
UndauntedNormal: $11.20
Reverse Holo: $32.78
#52
Call of LegendsNormal: $7.45
Reverse Holo: $53.40
#BW89
BW Black Star PromosHolo: $92.62
#25
Dark ExplorersNormal: $8.30
League: $54.40
Staff: $449.99
Reverse Holo: $29.46
#20
Plasma FreezeNormal: $4.66
Reverse Holo: $61.73
#22
Ancient OriginsCosmos Holo: $25.31
Normal: $1.19
Reverse Holo: $3.28
#24
GenerationsHolo: $28.25
#SM172
SM Black Star PromosHolo: $11.47
Jumbo: $18.54
#18
Hidden FatesHolo: $1.71
Reverse Holo: $2.80
#42
Cosmic EclipseNormal: $1.99
Reverse Holo: $11.62
#SWSH072
SWSH Black Star PromosHolo: $5.62
#SWSH150
SWSH Black Star PromosHolo: $4.88
Play! Pokémon Holo: $31.74
#SWSH181
SWSH Black Star PromosHolo: $91.35
#SWSH182
SWSH Black Star PromosHolo: $78.21
Jumbo: $19.53
#30
Vivid VoltageCosmos Holo: $3.78
Normal: $0.46
Reverse Holo: $1.16
#30
Evolving SkiesHolo: $11.32
Play! Pokémon Holo: $149.21
#172
Evolving SkiesHolo: $26.43
#TG02
Brilliant StarsHolo: $23.20
#168
Scarlet & Violet Black Star PromosHolo: $0.85
#134
151Holo: $0.30
Reverse Holo: $1.51
#22
Prismatic EvolutionsHolo: $0.35
Cosmos Holo: $0.96
Reverse Holo: $0.39
Poké Ball Foil: $1.68
Master Ball Foil: $32.56
#23
Prismatic EvolutionsHolo: $3.61
Play! Pokémon Holo: $19.19
Expansion Stamp: $6.77
#149
Prismatic EvolutionsHolo: $227.15