Sage (セージ Sēji?) is a character that appears in the Sonic Pokémon Series. She is a mysterious girl created by Doctor Eggman that appears across the Starfall Islands, cautioning Sonic the Hedgehog to leave the islands despite his mission to find and save his friends. After the events of Sonic Frontiers, she is a constant AI helping Eggman in cost of taking over planet Mobius and maybe beyond that. Sage has been described by Silver to be one of the many mysterious elements of the Starfall Islands.
Sage - Sonic Frontiers Sprites Reveal + Preview by Darknessx4 on DeviantArt
Sage (Trainer class) - Bulbapedia, the community-driven Pokémon encyclopedia
Amy Rose, P.M. Universe Wiki
Pokémon Sage - Wikipedia
Sage, Wiki
Mike Pollock (voice actor) - Wikipedia
Who was more popular, Sonic (in his golden days) or Pokemon (now)? - Quora
What What If scenarios or ideas would you like a Sonic game to be about? : r/SonicTheHedgehog
Sonic Frontiers Reaches The Final Horizon With Update #3 On September 28th - Games - Sonic Stadium
Do you think Super Sonic and Super Shadow together could defeat The End? : r/SonicTheHedgehog
Sonic Frontiers - Mainline Sonic Games - Sonic Stadium
Sage, Sonic Pokémon Wiki
Basilect, CAPX Wiki