In Gen 6, a new mechanic known as terrains were introduced. However, they never saw much attention from neither Gamefreak nor the competitive scene. But come Gen 7, terrains were given much more substantial effects on the metagame. But what if we took this to the extreme.....
All Terrain is a metagame in which all terrains are active permanently. Yes, Grassy, Electric, Misty and Psychic terrain are all active all at once. What does this mean battle wise?
- The power of Electric, Grass and Psychic attacks do times 1.5 damage if a grounded Pokemon uses them.
- Grounded Pokemon are immune to Status and confusion
- Dragon type attacks do 0.5 damage to grounded foes
- The power of Earthquake, Bulldoze and Magnitude are halved.
- 1/16 of maximum HP is healed at the end of each turn if the Pokemon is grounded
- Grounded Pokemon are immune to moves with boosted priority. (Whether naturally or with abilities such as Prankster)
- Pokemon with the ability Grass Pelt have their Defence boosted by 50%.
- Pokemon with the ability Surge Surfer have their Speed doubled.

Mechanic: All terrains are active permanently
Clauses: OU clauses
Bans: OU Banlist, Nature Power, Secret Power, Camoflauge, Alolan Raichu
Unbans: Landorus-I

Increased Viability

Mega Metagross
Resisting Psychic and Grass type moves are very important in this metagame, and carrying one of the terrain's STABs is also very important. Megagross's already high attack and power is pushed to near breaking point with its Zen Headbutt reaching incredible levels.


Electric Types
With their STAB being boosted and already having great coverage in itself, Electric types are prominent offensive threats in the metagame. This is furthur escalated with the nerf to Earthquake and Ground types in general, leaving typical ways to deal with Electric types gone out the window.


Dark Types
Dark types appreciate the surge *wink* of Psychic types in the metagame, as it gives them alot more switchins and options to Pursuit trap. The loss of Sucker Punch does hurt however.


Pokemon with immunities to a Terrain boosted type
The boosts in Grass, Electric and Psychic type attacks means a much greater need for Pokemon with immunities to each type, so Pokemon with them are appreciated.
Decreased Viability

Garchomp
Both of Garchomp's main STAB attacks are weakened, and while tank sets appreciate the free lefties and no toxic, they cant handle no offensive presence nor the power creep.


Physical Ground Types
With their main means of STAB depowered, most Ground types struggle to find a niche in the metagame. Notable exceptions are Golurk, Zygarde formes, Excadrill and Mudsdale, which have alternative STAB options that are not effected by Grassy Terrain.


Water Types
Both of the types Water types are weak to have boosted effects, making defensive water types less than ideal and gives offensive waters more threats to worry about. Keldeo gets a special mention as its weak to Psychic types too.

Q: Why is Landorus unbanned?
A: Due to the massive power creep this metagame produces, its Flying typing preventing from benefiting from the terrains and the overall expected dominance of Electric types, Landorus go unbanned.
Q: Can weather be setted or used in this metagame?
A: Yes. Weather operates just as normal as it would in standard.
Q: What if someone uses a terrain setting attack, or switches in a Tapu?
A: It won't work. Sorry Tapu Fans.

Will be updated soon
Last edited: