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;MOVE;swift}
Outskirt Stand, Phenac City, Cipher Lab (outside)	{Earthquake;MOVE;earthquake}
Pyrite Cave, Relic Cave, Mt. Battle (Areas 4-6), Deep Colosseum, Cave Poké Spot	{Shadow Ball;MOVE;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;MOVE;rock-slide}
Agate Village, Relic Stone, Mt. Battle (outside), Pokémon HQ Lab, Kaminko's House, Mt. Battle (Areas 1-3)	{Stun Spore;MOVE;stun-spore}
Relic Stone	{Razor Leaf;MOVE;razor-leaf}
Oasis Poké Spot	{Bubble Beam;MOVE;bubble-beam}
Gateon Port	{Surf;MOVE;surf}
Phenac Stadium	{Hydro Pump;MOVE;hydro-pump}

Gen 4

Terrain	Move
Building, Distortion World, and link battle	Tri Attack
Sand and plain terrain	{Earthquake;MOVE;earthquake}
Cave and rock	{Rock Slide;MOVE;rock-slide}
Tall grass	Seed Bomb
Water	{Hydro Pump;MOVE;hydro-pump}
Snow	Blizzard
Ice	Ice Beam
Marsh	Mud Bomb

Pokémon Battle Revolution

Colosseum	Move
Lagoon	{Tri Attack;MOVE;tri-attack}
Main Street	{Tri Attack;MOVE;tri-attack}
Neon	{Tri Attack;MOVE;tri-attack}
Courtyard	{Tri Attack;MOVE;tri-attack}
Gateway	{Hydro Pump;MOVE;hydro-pump}
Waterfall	{Seed Bomb;MOVE;seed-bomb}
Sunny Park	{Seed Bomb;MOVE;seed-bomb}
Crystal	{Rock Slide;MOVE;rock-slide}
Magma	{Rock Slide;MOVE;rock-slide}
Stargazer	{Rock Slide;MOVE;rock-slide}
Sunset	{Earthquake;MOVE;earthquake}

Gen 5

Terrain	Move
Building and urban	{Tri Attack;MOVE;tri-attack}
Sand, plain terrain, rock and link battle	{Earthquake;MOVE;earthquake}
Cave	{Rock Slide;MOVE;rock-slide}
Grass	{Seed Bomb;MOVE;seed-bomb}
Water	{Hydro Pump;MOVE;hydro-pump}
Puddles	{Mud Bomb;MOVE;mud-bomb}
Snow	{Blizzard;MOVE;blizzard}
Ice	{Ice Beam;MOVE;ice-beam}

Gen 6

Terrain	Move
Building, plain terrain, Sky Battles, and link battles	{Tri Attack;MOVE;tri-attack}
Cave and Cyllage Gym	Power Gem
Sand and rock	Earth Power
Swamp water and marsh	{Mud Bomb;MOVE;mud-bomb}
Water and underwater	{Hydro Pump;MOVE;hydro-pump}
Snow	Frost Breath
Ice and Snowbelle Gym	{Ice Beam;MOVE;ice-beam}
Volcano	Lava Plume
Burial ground	{Shadow Ball;MOVE;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;MOVE;tri-attack}
Cave	{Power Gem;MOVE;power-gem}
Sand, dirt, and rock	{Earth Power;MOVE;earth-power}
Water	{Hydro Pump;MOVE;hydro-pump}
Snow and ice	{Ice Beam;MOVE;ice-beam}
Volcano	{Lava Plume;MOVE;lava-plume}
Ultra Space	Psyshock
Grass, field, flowers, and on Grassy Terrain	{Energy Ball;MOVE;energy-ball}
On {Misty Terrain;MOVE;misty-terrain}	{Moonblast;MOVE;moonblast}
On {Electric Terrain;MOVE;electric-terrain}	{Thunderbolt;MOVE;thunderbolt}
On Psychic Terrain	Psychic

Gen 8

Terrain	Move
Building, urban, Gym, battlefield, and link battles	{Tri Attack;MOVE;tri-attack}
Cave	{Power Gem;MOVE;power-gem}
Sand, rock, Pokémon Den, and Crown Tundra grass	{Earth Power;MOVE;earth-power}
Water	{Hydro Pump;MOVE;hydro-pump}
Snow and ice	{Ice Beam;MOVE;ice-beam}
Bridge	{Air Slash;MOVE;air-slash}
Grass, field, flowers, and on {Grassy Terrain;MOVE;grassy-terrain}	{Energy Ball;MOVE;energy-ball}
On {Misty Terrain;MOVE;misty-terrain}	{Moonblast;MOVE;moonblast}
On {Electric Terrain;MOVE;electric-terrain}	{Thunderbolt;MOVE;thunderbolt}
On {Psychic Terrain;MOVE;psychic-terrain}	{Psychic;MOVE;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.