Oh boy. Search Megaman Battlenetwork 3 White ROM on Google and you'll get enough hits on the first page to download at least 3. But don't ask that question. Please.
you have to buy the game
no you can only link megaman games together if it is the same number like megaman battle network 3 blue to megaman battle network 3 white
battle network 1
go to www.google.com and type in gameshake codes for megaman battle network 1
Megaman Battle Network game is a spin-off of the original Megaman and was released in 2001 for Game Boy Advance. In Japan it it is known as The Rockman.
yes it is they got battle network 1-6
Megaman legends is not available for retail download. You'll have to purchase the physical CD-ROM.
you buy it
Amazon.
The final boss of Megaman Battle Network 4 is Duo. It does not matter which version you have. However, after defeating Duo, there are optional bosses.
in the 3rd battle network
Kill them