Luffy got his scar on his chest from Roronoa Zoro this happened while Zoro's being controlled on Episode 223 from 10:55 - 11:10.
The arc is actually a loose adaption of a 2003 PlayStation game titled One Piece: Ocean's Dream! During this arc, Luffy and a hypnotized Zoro end up fighting, resulting in an X scar across Luffy's chest when he was wounded by Zoro.
It's in episode 223 when all except Luffy and Robin has no memory of becoming pirates. Zoro gets hypnotised by a memory thief and attacks Luffy. In the fight, Zoro uses his Katana and make a X mark on Luffy's chest. That is how Luffy got his scar.
Luffy got the scar on his chest during the war at Marineford, in One Piece anime episode 487 titled “Akainu's Tenacity! The Fist of the Magma Attacks Luffy”.
Mihawk cuts Zoro's chest.
In the manga, it showed he lost it by throwing the little blade of Mihawk, like he did for the cursed sword, but he wasn't ready for even the tiny little knife and he loses his eye.
The circumstances surrounding Zoro's left eye aren't a complete mystery; at the very least fans know that it happened sometime during the two-year time skip. During this time, each member of the Straw Hat crew committed to training and growing stronger.
In Episode Four, due to a minor scuffle, Luffy is thrown into the water by some pirates and finds himself near the jaws of a vicious Sea King. Just as he is about to be eaten by the Sea King, Shanks comes and saves him, only to end up losing his own arm.
In the two-year time skip, Zoro trained under Dracule Mihawk, popularly known as Hawk Eyes Mihawk. One of the popular theories is that the scar on Zoro's left eye is a training mishap. Many believe that Zoro lost his left eye during his training in some sort of accident or battle.
It is during this fight that Zoro lands a strong surprise attack on Luffy, slicing his chest and thus giving him the X-shaped scar. Later in the series, Luffy's scar looks more like the after-effect of an explosion, which is in line with Akainu's magma punch.
Chapter 438 is titled "Pride".
How did Luffy got his famous face scar on? The one under his eye, or the huge x on his chest? The one under his eye was gotten when he was trying to prove to Shanks he was fearless and used a knife to do so himself.
While One Piece has many superb side characters, Big News Morgans just proved why he is the best of them by betraying Luffy and his crew. This may not seem like an action that would endear Morgans to One Piece's fans, but his reasons for doing this give him a delightful layer of complexity.
Who is Luffy's love interest? Luffy is the protagonist of the anime/manga series One Piece and the love interest of the pirate Empress Boa Hancock.
Luffy got his scar on his chest from Roronoa Zoro this happened while Zoro's being controlled on Episode 223 from 10:55 - 11:10.
Showdown Between the True Powers of the Devil Fruit!" is the 8th episode of the One Piece anime.
Prior to One Piece's timeskip, Zoro's left eye was fully functioning and completely uninjured. Yet when the Straw Hats reunited after their respective adventures, Zoro's left eye was mysteriously scarred shut.
Shichibukai Bartholomew Kuma sent Zoro to Kuraigana Island, where the World's Strongest Swordsman, Dracule Mihawk resided. The two years that Zoro had to his disposal were spent honing his skill under Mihawk's guidance. Like Sanji, he managed to learn the basics of Haki and improved his swordsmanship skills greatly.
In order to save the Straw Hat Pirate from the warden Magellan's venom, Emporio Ivankov used their Devil Fruit powers to alter the hormones in the boy's body to strengthen his immune system. The process was excruciating, lasted for hours, and ultimately took approximately 10 years off of Luffy's life expectancy.
Luffy has lost teeth before in a comedic fashion (Skypeia) and Usopp has lost teeth in battle (Alabasta, etc) and they have always come back.
He does not smile for quite some time following his victory, because he continues to go through troubling situations. Four episodes pass until he finally smiles again, once he makes a "safe" landing on a building with Nami after using his Devil Fruit powers to trapeze through the air.
Usopp remains to be the weakest member of the Straw Hat Pirates. In Wano, the vast majority of the members of the Straw Hat crew received good power-ups. However, Usopp was one of the members who did not receive any power-up and thus is lagging behind.
Oda continues to estimate when the final plot will be delivered but pushes those dates back in favour of more content. His most recent predications suggested One Piece could potentially conclude in either 2024 or 2025 but given the show's history, nothing is set in stone.
Zoro wanted to see if he was worthy of Mihawks little knife necklace thing so he threw it it the air (like his cursed sword) and it slashed his eye which meant he still wasn't worthy to wield that knife.