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you buy it from a shop
Mamoru's room.
Seaside Area 1.
http://tartarus.rpgclassics.com/mmbn4/walkthrough23a.shtml
Insert a Megaman Battle Network game into the secondary slot of your DS, then pulse in. Now go to the DogHouse near Bud's house and you'll find Megaman there.
you can find flameman in undernet three where four pots with fire on them are placed.
you have to find the back of the undernet
The GameFAQ's site has a section for Megaman Battle Network 3 that includes multiple walkthroughs and FAQs and some cheat codes. SuperCheats has an extensive and well-organized list of cheats for the game, as well as tips.
One's in a tree at the park and one's in Yai's house under the teddy bear.
Go in park area 2
you hold select and imput the compression code you can find those on the internet
WWW is in undernet 4. to get to the undernet go to netopia 3 and go up the rampand find a purple netnavi that patrols the entrance and there it is