Kaitou Sentai Lupinranger vs. Keisatsu Sentai Patranger S01 E33 We Are the Young Phantom Thieves

"Heroic Outlaws vs. Absolute Heroes"

The Lupinranger show up ready to fight a Ganglar, but get turned into children instead! Umika drops her VS Changer, which is found by the police, and so the thieves must steal it back.