The Red Chain is an item created from crystals drawn from the Sinnoh’s lake guardians. It is used to take control over the Legendary Pokémon Dialga and Palkia, so as not to reduce their power by capturing them in a Poké Ball.
Here’s another legend that never gets any fanart or recognition outside of the competitive scene - Heatran! I’m not sure about my headcanon for it either. I’ve always thought of it more like a wild animal, a bit like a “guard dog” of Earth’s core.
THERE ARE THOSE WHO MIGHT SAY THAT YOU DO NOT HAVE THE RIGHT TO EXIST. THAT YOU MUST BE REMOVED FOR THIS WORLD TO TRULY BE IDEAL. THEY WISH FOR YOU TO DROWN IN THE DESPAIR AND NEGATIVITY THAT THEY SPREAD, SO THAT YOU MAY NOT REALIZE THE FULL EXTENT OF YOUR GREATNESS.
THEY KNOW NOTHING OF THE SCOPE OF YOUR IMPORTANCE IN THIS UNIVERSE. YOU ARE STRONG. YOU CAN ENDURE. THE FUTURE IS YOURS!
THIS TIMELINE IS A PARTICULARLY DARK AND TRYING ONE. BUT YOU MUST PERSEVERE!