Nature Power

Uses a move which depends upon the terrain.

Nature Power turns into a variety of different moves depending on the current terrain.
The same-type attack bonus only applies to the move Nature Power turns into.
Nature Power gains priortiy from Prankster despite always calling a damaging move.
The list of moves Nature Power varies highly by generation:

Gen 3

Terrain	Move
Building, plain terrain, and link battle	Swift
Sand	Earthquake
Cave	Shadow Ball
Rock	Rock Slide
Tall grass	Stun Spore
Long grass	Razor Leaf
Pond water	Bubble Beam
Sea water	Surf
Underwater	Hydro Pump

Pokémon Colosseum and Pokémon XD

Terrain	Move
Buildings, Mt. Battle (Areas 1-3)	Swift
Outskirt Stand, Phenac City, Cipher Lab (outside)	Earthquake
Pyrite Cave, Relic Cave, Mt. Battle (Areas 4-6), Deep Colosseum, Cave Poké Spot	Shadow Ball
Pyrite Town, The Under, Cipher Key Lair (outside), Citadark Isle (outside), Rock Poké Spot, Pyrite Colosseum, Mt. Battle (Areas 7-10)	Rock Slide
Agate Village, Relic Stone, Mt. Battle (outside), Pokémon HQ Lab, Kaminko's House, Mt. Battle (Areas 1-3)	Stun Spore
Relic Stone	Razor Leaf
Oasis Poké Spot	Bubble Beam
Gateon Port	Surf
Phenac Stadium	Hydro Pump

Gen 4

Terrain	Move
Building, Distortion World, and link battle	Tri Attack
Sand and plain terrain	Earthquake
Cave and rock	Rock Slide
Tall grass	Seed Bomb
Water	Hydro Pump
Snow	Blizzard
Ice	Ice Beam
Marsh	Mud Bomb

Pokémon Battle Revolution

Colosseum	Move
Lagoon	Tri Attack
Main Street	Tri Attack
Neon	Tri Attack
Courtyard	Tri Attack
Gateway	Hydro Pump
Waterfall	Seed Bomb
Sunny Park	Seed Bomb
Crystal	Rock Slide
Magma	Rock Slide
Stargazer	Rock Slide
Sunset	Earthquake

Gen 5

Terrain	Move
Building and urban	Tri Attack
Sand, plain terrain, rock and link battle	Earthquake
Cave	Rock Slide
Grass	Seed Bomb
Water	Hydro Pump
Puddles	Mud Bomb
Snow	Blizzard
Ice	Ice Beam

Gen 6

Terrain	Move
Building, plain terrain, Sky Battles, and link battles	Tri Attack
Cave and Cyllage Gym	Power Gem
Sand and rock	Earth Power
Swamp water and marsh	Mud Bomb
Water and underwater	Hydro Pump
Snow	Frost Breath
Ice and Snowbelle Gym	Ice Beam
Volcano	Lava Plume
Burial ground	Shadow Ball
Soaring in the sky and Sky Pillar	Air Slash
Space	Draco Meteor
Grass, Grassy Terrain, and Coumarine Gym	Energy Ball
On Misty Terrain	Moonblast
On Electric Terrain	Thunderbolt

Gen 7

Terrain	Move
Building, road, plain terrain, and link battles	Tri Attack
Cave	Power Gem
Sand, dirt, and rock	Earth Power
Water	Hydro Pump
Snow and ice	Ice Beam
Volcano	Lava Plume
Ultra Space	Psyshock
Grass, field, flowers, and on Grassy Terrain	Energy Ball
On Misty Terrain	Moonblast
On Electric Terrain	Thunderbolt
On Psychic Terrain	Psychic

Gen 8

Terrain	Move
Building, urban, Gym, battlefield, and link battles	Tri Attack
Cave	Power Gem
Sand, rock, Pokémon Den, and Crown Tundra grass	Earth Power
Water	Hydro Pump
Snow and ice	Ice Beam
Bridge	Air Slash
Grass, field, flowers, and on Grassy Terrain	Energy Ball
On Misty Terrain	Moonblast
On Electric Terrain	Thunderbolt
On Psychic Terrain	Psychic

• In Gen 3-5 Nature Power always technically selects the user and always damages the Pokémon directly in front of it (or an adjacent Pokémon if no Pokémon is in front of it).
• From Gen 9 onwards this move can not be selected in battle.