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Applin who eat a sour apple evolve into a Flapple. Its cheeks store acid strong enough to induce chemical burns, which it is able to spit at its targets. It flies using its wings made of apple skin. It can make itself look like an apple.
Flapple exposed to Gigantamax energy change into the shape of a giant apple and 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 and Appletun have physically identical Gigantamax forms, but they are still treated as different Pokémon as they have distinct Pokédex entries and G-Max Moves.
Flapple appears to be based on a worm, and may be based on the concept of a worm burrowing inside of an apple. Considering its Dragon typing, it may be a pun on wyrm. Its Gigantamax form appears to be based on a caramel apple.
Name origin
Flapple may be a combination of flap and apple.
Appuryū may be a combination of apple and 竜 ryū (dragon).