Thought I'd be the first one to post Alola variant forms on here, so I thought I'd start off with an Alola form of Koffing.
Koffing was brought into the Alola region when criminals from Kanto tried to expand their organization, though they mysteriously stopped their operations twenty years ago. In most regions, Koffing is known for emitting toxic gases. However, after being exposed to the tropical climates and luscious plant life of Alola, its body started emitting pleasant aromas and took on this form.
Alolan Koffing is often seen consuming flowers and other pleasant-smelling substances in order to release gases from its body. This gas emits a soothing fragrance that can immediately relax both humans and pokémon. Since its body is no longer filled with toxic gases, Alolan Koffing cannot levitate like ones in other regions, so it travels by rolling like a ball- thereby expelling the gases in a stream-like style.