Mega Man Battle Network 4 Blue Moon - Platform: Gameboy Advance

Secret Boss: 
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To get past the gate in Ura Internet area 5, you need 
all 150 regular chips. Once you get past it, you can 
fight the secret boss, Forte, and get his chip, Forte Another 

Secret Boss SP:
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After defeating Forte in Ura Internet 5, Forte SP can 
be randomly encountered in Black Earth 2. He can drop 
Delta Ray Edge in Blue Moon, and Black Barrier in Red Sun. 

Secret Dungeon:
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There is a large hole surrounded by purple slime on a 
platform in Ura Internet area 6. In order to approach 
it, you need the chips "Bug Curse", "Muramasa Blade", 
"Black Wing", "Element Dark" and "Poison Anubis". 
Once you get close enough, it will suck you down to 
the secret dungeon, Black Earth.