You can find all of those mega chips by the Game Faqs or cheat or cheat code or game shark code.
supercheats.com
The Navi master is your father.
First, you have to find the beta or omega version of the Navi. Then, beat them with a busting level 8, 9, or S. If you beat them with 10, you'll get the DS chip.
You need 100 standard chips you go to the under net 3 ten find the secret path to undernet 2
Don't know how to get there but he's in the basement of thr hosptial.
Keep playing through the game. If you mean how to find him in the squirrel, check Game FAQs.
Beat the fan enemies in Yoka ....1? The area with the heater in it. If you don't get it, just keep trying.
get to undernet with all 150 standard chips
I think its from the MEGA Driller at Voltabolts challenge.
Rank 8 is in Undernet 3, where you fought FlamMan and Bass. And it just so happens that it's a very familiar navi . . .
To obtain DolThunder A in MegaMan Battle Network 6, you need to defeat the enemy known as "DolThunder" found in the UnderNet area. After defeating it, you have a chance to receive the chip as a drop. Additionally, you can also find it in certain areas by searching for it in the folders of defeated enemies. Make sure to check your Battle Chips after battles to see if you’ve acquired it.
Ive been looking around for the same code as well, but I can't find it. But i will definitely come back here and post it once I find it. (I have Red Joker, but if I find a code for one or the other, or even both, Ill post it. =)