Solid Rock

 is a Pokémon ability introduced in the third generation. It reduces the damage of super effective moves. The ability Filter has identical effects.

Description
This ability reduces damage from super effective moves by 1/4. A move that normally deals 2x damage only deals 1.5x damage and a move that normal deals 4x damage will deal only 3x damage.

Pokémon with Ability

 * Camerupt
 * Rhyperior
 * Tirtouga
 * Carracosta

As Filter

 * Mr. Mime
 * Mime Jr.
 * Mega Aggron

Trivia

 * The ability Prism Armor is similar except it isn't ignored by Mold Breaker and similar
 * All Pokémon with Solid Rock are Rock-types with a 4x weakness.
 * Filter used to be the signature ability of the Mr. Mime line until the sixth generation