Chip Away is an offensive Normal-type move. The attack ignores any changes to the target's stats (i.e. Defense, Special Defense, and Evasion); this includes negative as well as positive changes. Chip Away does not ignore changes to the target as a result of Reflect, abilities like Sand Veil, or items like Eviolite. It is also still affected by changes to the user's Attack or Accuracy.
Pokémon that learn Chip Away
By leveling up