Basically I'm too lazy to make a shit ton of hybrid Dino mamono for you and the way I worked things there's pretty much infinite possibilities here. So here you can make your own.
Info on Hybrid Dinos can be found here: http://monstergirlencyclopedia.wikia.com/wiki/Thread:538542?useskin=oasis
Imfo on the Reptile Kingdom can be found here: http://monstergirlencyclopedia.wikia.com/wiki/User_blog:The_Reptile_King/The_Reptile_Kingdom?useskin=oasis
Just remember that you're never going to do better than millions of years of evolution and if you make an over powered mass of stupid, I'm gonna slap on some weaknesses. Also try to stick with either canon mamono or mamono that I have made. These hybrids are artificially produced. They have no set habitat beyond where their creator made them. Throwing in dinos that aren't already out as mamono makes it non cannon to the Reptile Kingdom.