I've been looking all over the internet for GameShark/CodeBreaker cheats for this game, and while I've found a lot I am looking specifically for a code that causes Mega Man to gain a new style after one battle (preferably one but if anyone can get that number down from 100 I would still be grateful).
I found this old guide: https://www.ign.com/faqs/2003/mega-man-battle-network-3-blue-version-patch-code-faq-426807
...which has this code:
296C1DD5 BC1F6B11
B2CE0DC1 1F0A7367...
Looking for Mega Man Battle Network 3: White gameshark/codebreaker Style Change code
I found this old guide: https://www.ign.com/faqs/2003/mega-man-battle-network-3-blue-version-patch-code-faq-426807
...which has this code:
296C1DD5 BC1F6B11
B2CE0DC1 1F0A7367...
Looking for Mega Man Battle Network 3: White gameshark/codebreaker Style Change code