 If you liked
Shippuu! Iron Leaguer
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 ...then you might like
Yuusha Keisatsu J-Decker
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If you liked Brave Police J-Decker for the robots, you might like Iron Leaguer as well. They are both Sunrise animations, and robots are the main characters as well. The main difference is
A: Iron Leaguer is a sports anime
B: Iron Leaguer robots look a little more like mascot characters and are smaller in size
But they have a pretty similar tone, and a lot of episodes can range from sillier to more serious, similar to Brave Police J-Decker.
Also they both have fantastic openings