The core of the show's mecha combination and final attack weapon combination is the Good Striker, a mecha who appears in the midst of battle to whomever it feels like helping at the moment. That being said, it has two forms for each team.
The Patranger's Good Striker on the other hand, combines with the Trigger Machine #1, Trigger Machine #2, and Trigger Machine #3 to form the Pat Kaizer. In addition, it can also combine with the team's VS Changer, which will fuse the Patrangers into a single entity to perform the team's finishing attack!
Kaito Sentai Lupinranger vs. Keisatsu Sentai Patranger is set for a February 11, 2018 premiere.
[Source: Erasu, HeroShock (link 2), SpecialForm12]