Beakle

Beakle is a Normal Pokemon with the ability Volatile. When it's hit by an elemental attack it takes on the properties of that attack due to the liquid inside. For example intense heat will cause it to heat up and boil, making it a Normal/Fire type, electrocuting it will cause the liquid to absorb and generate electricity, making it a Normal/Electric type. The only types this doesn't work with are Bug, Normal, Fighting, Steel and Dark moves.