Mega Sol

Full effect

Even when the sunlight has not turned harsh, the Pokémon can use its moves as if the weather were harsh sunlight.

In game description

Even when the sunlight has not turned harsh, the Pokémon can use its moves as if the weather were harsh sunlight.

Using Mega Sol in Cobblemon

Abilities are passive and always active, so Mega Sol 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.