Teraform Zero
As soon as Terapagos assumes its Stellar Form, it will immediately neutralize weather and terrain effects.
Full effect
When Terapagos changes into its Stellar Form, it uses its hidden powers to eliminate all effects of weather and terrain, reducing them to zero.
In game description
When Terapagos changes into its Stellar Form, it uses its hidden powers to eliminate all effects of weather and terrain, reducing them to zero.
Using Teraform Zero in Cobblemon
Abilities are passive and always active, so Teraform Zero costs you nothing to run. If it is marked hidden on a species above, expect it to be harder to obtain: servers differ in whether hidden abilities come from breeding, an Ability Patch, or events.
See the Pokedex for which abilities each species can have, and IVs, EVs and breeding for how to actually pass one down.