 If you liked
Kidou Butouden G Gundam
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 ...then you might like
Shinkon Gattai Godannar!!
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Both are very fun super robot shows. They involve pilots from various countries working together to face a larger threat. Both have a very strong emphasis on romance as well.
Of course, Godannar does have much more fanservice, but despite that, the two series have a very similar feel.