I have been fishing the Mon all my life and have been fishing for flats for 3 years, if you want to catch alot of small flatheads I would say creek chubs and small suckers but if you want to get the big boys you need big bait, you will not catch as many but when you do it will be big. For the big ones I wouls say gills first (6"to 10") than big suckers as big as you can get them, also rock bass, drum, and trout. I got one last Friday on a 14" sucker, the fish did not play with it just grabed it and a slow steady pull with the clicker on, I let him run for about 15 sec than turned off the clicker and let the circle hook do the rest