Ok. You might need to evolve some monsters. But without a lot of your monsters, this is what I’d try if I had them. For your frontline consider
A Stun immune FL: Dracosa, magmarinus, Kamiwyrm and mon of your choice (i’d go jackelhotep). Put Valza 5th to come in and do some damage. He should avoid a chrono shot with his shield and if the enemy is running stun you’ve won the game. Draco will take care of poison and Kami will sort most sleep and protectors. Switch it for shadowyrm if you get one. If you do go hotep, consider having someone with purify in your last slot if things get really sticky.
Alternatively You could try Dracosa with his two grass buddies (can’t remember what they’re called -
Towards the end of your team you could try Solblaze, infernicorn and the fire guy with stunning entrance. Sol can help put the enemy to sleep while infernicorn wrecks the other monsters, with fire guy to support and heal.
I hope that helps dude! Good luck with the game