it is used naturally without you seeing it.
Badges have passive abilities. Just having it activates any abilities it might give.
Badges allow you to use secret moves outside of battle, higher pokemon's stats and help them obey you.
The badges you collect from defeating gym leaders will help you gain access to the Victory Road and Indigo Plateau after the last gym leader. The badges also help with controlling your Pokemon at different levels. Some badges also let you use HM moves, like fly and surf, outside of battle.
These badges are very important to me.
Yes you can. Use a link cable.
WikiGuides have badges they use for messages on the message boards. They do not give WikiAnswers badges out that go on the profiles.
Strength
The badges are just,there for you to be able to use HMS outside of battle and for high levels of Pokemon to listen to you depending on the badge...
because we can
Yes, there is a PAL version of the Action Replay code for Paper Mario: The Thousand-Year Door (TTYD) that allows players to have all badges. The codes may vary slightly between different regions, so it's important to ensure you use the correct code for the PAL version of the game. You can typically find these codes on gaming forums or websites dedicated to cheat codes. Always use cheats with caution, as they can sometimes lead to game instability.
You don't use them, you just collect them. Certain badges grant your Pokémon certain things such as more attack, defense, speed, etc. Also, if you get more badges, you will be able to use HMs (Hidden Machines such as Cut, Fly, etc.)
you use strength