This section is incomplete. Please feel free to edit this section to add missing information and complete it. Reason: Describing Gigantamax Flapple's appearance.
Flapple is a green worm-like dragon Pokémon with a light green underside and yellow eyes. It uses parts of an apple to form its body. It has one part on the top of its head with a single horn sticking out, one on the bottom that is attached to its tail and two parts as wings that are attached to two limbs with three-claw hands.
Its cheeks store acid strong enough to induce chemical burns, which it is able to spit at its targets. It can disguise itself as an apple by folding its apple peels.
When exposed to Gigantamax energy, Flapple changes into the shape of a giant apple. The sweet nectar that covers its body increases in thickness, allowing it to absorb more damage than normal. It can shoot out nectar, enough to be able drown its opponents in the blast of nectar. Flapple can produce significantly more sweet nectar. An intensely sweet aroma of nectar pours out when it stretches its neck, and this aroma is so sweet it can cause other Pokémon to faint by merely taking a sniff of the scent.
Flapple may be based on the larvae of Codling moths, which burrow into apples and feed on their cores, while also sharing visual similarities with geckos. The powerful acid it spits may be a reference to amygdalin, a chemical compound found in apple seeds, which releases cyanide into the body when digested. Its Gigantamax form appears to be based on a caramel apple, and its ability to make Pokémon faint due to its sweetness may be a reference to a diabetic coma. Considering its Dragon typing, it may be a visual pun on "wyrm", the Old English word for not only worms, but also serpentine dragons.