Hustle, an above-average Speed, and a good offensive typing make Delibird a niche mixed wallbreaker. Delibird uses Substitute to capitalize on the switches it forces against slower foes like Gloom, Tropius, and Meditite, protecting it from revenge killers like Ponyta, Quilava, and Aipom and decreasing the need to predict correctly. Aerial Ace is Delibird's most reliable strong attack by circumventing the accuracy nerf of Hustle, and it threatens Bug-types such as Ariados, Beedrill, and Dustox. Ice Beam best complements Aerial Ace by threatening physically bulky Pokemon like Onix, Koffing, and Rhyhorn. Hidden Power Ground covers Electric-types like Chinchou, Magnemite, and Flaaffy, and it's Delibird's strongest attack against Corsola. 68 Special Attack EVs let Delibird 2HKO Koffing and Lileep. Delibird hardly has the bulk to make its choice of defense-lowering nature matter, but a Hasty nature at least gives Delibird an 88.3% chance to avoid a 2HKO from physically defensive Mightyena's Crunch. A Naive nature keeps it out of range of Doduo's Quick Attack slightly better, which is helpful when Delibird risks putting itself into range of Quick Attack when using Substitute.
Offense teams benefit from Delibird's presence as an especially threatening wallbreaker, but balance teams can make up for Delibird's lack of defensive value by relying on bulkier Pokemon to get it into good positions. Bulky Water-types like Wartortle and Seaking can intercept fast Fire-types for Delibird, while Delibird threatens Grass-types for them. Bulky Normal-types like Castform and Porygon can similarly check Ponyta and Quilava, and they also have good matchups against the fast Electric-types, Elekid and Voltorb. Delcatty is an especially good bulky Normal-type to pair with Delibird, as it can pivot it in safely with Baton Pass. Electric-types like Flaaffy and Chinchou threaten bulky Water-types that would check Delibird, while Delibird pressures bulky Grass-types like Gloom and Tropius that would wall its Electric-type partners. Bulky Normal-types, Electric-types, and Gloom can all support Delibird by spreading paralysis, enabling Delibird to outrun and dispose of fast, frail offensive threats. Delibird's unable to break through Corsola and other bulky Water-types like Seaking and Wartortle on its own, so it depends on support against them, which can include Gloom, Flaaffy, Chinchou, and Thunderbolt variants of Porygon.
