newbie here, help on synth

i got my slider scroll awhile ago, do i need to worry on the monsters grade to be used on slider scroll or i can make it up on breeding? do i need to find high grade monsters to use on synth? btw im just lvl 13

Not to worry. Any grade will be fine. But if you use higher grade synthesis monsters, your product monster will have a better grade too (about the average of everything you used).

You can make another slider and breed together to get a higher grade

Tnx alot! Its so hard for me to capture a C monster, so breeding is the best way to upgrade ty