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
you buy it
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.
currently there isn't any info about Megaman Starforce 4 , but there will be a crossover game with Megaman Starforce and Megaman Battle Network for the DS
no
yes but you must use a cable
people with heads
it is in the tree by the pink squirl
4-d x-dragon ninE
some where in castillo area from the net
The NebulaCD is used for opening the doors with the skull on it at the Net.
Use it when an enemy appears on your side on the field.