Giallo was one of the Sages that stood by Ghetsis and claimed the Pokémon were enslaved by humans. To free the Pokémon from humans, Ghetsis sent Giallo to find more information about the Legendary Trio: Tornadus, Thundurus and Landorus.
Black & White arc
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Black 2 & White 2 arc
When speaking to Blake, Leo remembered the Seven Sages that caused trouble during the Unova Pokémon League.
Blake reported to Looker that Giallo was seen around Aspertia City. Once Blake faced a Tornadus, Looker believed it was Giallo, who used a mirror to transform Tornadus.
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