The largest fleet that I have seen had 163 Corvettes , 142 Gunboats, 18 Neb-B Cruisers,
34 X-Wing, 29 A-Wing, 4 Y-Wing, and 3 Mon Cal Cruisers. and the funniest thing is that he had every hero he could possibly have.
I only had 42 ISD's, 5 Tartans, 64 Victory, 2 Interdictor, and 5 Broadside cruisers. But on the planet I had the Planetary Gun, No to mention a level 5 Space Station.
At the end i only had few ships left but they only had the Sundered Heart and Akbar.