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Heartwarming: Tokumei Sentai Go-Busters vs. Kaizoku Sentai Gokaiger: The Movie
The Go-Busters' Buddyroids are disabled with their personalities having been wiped, but the team insists on bringing their mecha into battle. Even when Enter's about to kill them all, the Busters refuse to abandon their partners, and the strength of their belief causes a massive reaction in the bots' programming, bringing their personalities back and allowing them to turn the tide.
When Bacchus Gil demands to know why the Gokaiger insist on defending Earth, Marvelous rebukes him by saying Earth's already got a team protecting it (meaning the Go-Busters). Considering that Marvelous had trouble trusting the Busters earlier on, it goes to show what an impression they made at him.
Plus, at the end when the teams part ways, Marvelous tells the Go-Busters they make a good thirty-sixth Super Sentai. Then they reenact the torch-passing moment with Hiromu catching Marv's punch.