Hey visit
here and read it carefully, just because it has strategies for all the bosses.
As for Big Bridge you CAN avoid battles. When I was doing my speed run, I got ONE battle (Lil Chariot) before Gilgamesh, and NO battles after him.
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A: Lil Chariott x 3
B: Neogalura
C: Fishman x 3
D: Fishman x 2, Neogalura
E: Lil Chariott x 2, Flying Killer x 2。
F: Lil Chariott x 2, Flying Killer x 2 or Flying Killer x 3
G: Flying Killer
Map from
Low Level Challenge Report (Jap)
I hope it will help