Moody

 is an Ability that raises one of the user's stats and lowers another.

Effect
When attacked, there is a chance that the user will have one stat drastically raised and another harshly lowered.

Pokémon with

 * Remoraid
 * Octillery
 * Smeargle
 * Snorunt
 * Glalie
 * Bidoof
 * Bibarel