Mega Man Battle Network 4 Red Sun - 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. 

Secret Boss 2:
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After completing the Black Earth dungeon, exit (plug out) 
and re-enter. You can now encounter Forte SP in Black Earth 
area 2, and obtain Black Barrier from him. 

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 Charge", "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. 

Bug Chain:
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Defeat either ShademanSP or LasermanSP without destroying 
the Green Mystery Data to obtain this giga-level chip. 

Darkness Aura:
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S-Rank ForteSP, a random encounter in Black Earth 2 to obtain 
this chip. 

Forte:
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Defeat Forte behind the Standard Gate in the Ura-Internet 
to obtain this chip.