 If you liked Pokemon |  ...then you might like Jikuu Tantei Genshi-kun |
Both stories are about kids, cute & powerful creatures and adventures.
report Recommended by LegionIscariot
Both feature young boy main characters who befriend and battle alongside monster friends. They are huge parallels between both shows "evil teams", Flint the time Detective villains are very Team Rocket-esque. In both the monsters can evolve and change appearance.
report Recommended by JVskunkape