In the Power Rangers universe, specifically in the context of "Super Megaforce," the Super Mega Rangers do encounter various allies from past seasons. However, regarding the specific scenario you've described where the Super Sonic Rangers didn't help Megaforce Rangers in their battle against the Armada, there may be some confusion.
The Super Sonic Rangers are not an official team within the Power Rangers franchise. Instead, "Super Megaforce" features the Megaforce Rangers who can utilize powers from past Ranger teams, including those from "Lost Galaxy" and "In Space." In the series finale, "Samurai Surprise," the Rangers showcased powers from various Ranger teams but faced challenges against the Armada.
If you're referencing a fan theory or alternate fan fiction regarding the Super Sonic Rangers, it would be separate from the official canon established by Saban and later Hasbro with the Power Rangers series.