 If you liked
Jikuu Tantei Genshi-kun
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 ...then you might like
Rokumon Tengai Mon Colle Knights
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In both series:
- a boy and a girl need to catch/save monsters (in Flint the time detective, Flint will help the main boy and girl character)
- need to travel to a different world to do so
- get help from a weirdo, but funny professor
- the bad guys exist out of a bossy leader who can be angry quickly and two helpers.