Pokemon Trainer Red is the main protagonist of Pokemon Red and Blue. He was the champion of the Indigo League before Gold defeated him. But we all wonder one thing. WHY CAN'T RED TALK? Whenever the text box comes, all that we see is "Red: ..."! But today I'm solving this.
Mount Silver Edit
Red has talked before in Pokemon Red and Blue. He spoke twice (once if you don't count the copycat thing), so we know he used to talk. But what happened? That's our mystery. So we see Red on Mt. Silver in Pokemon Gold and Silver. As revealed by a member of Game Freak, Pokemon Gold and Silver takes place exactly 3 years after the events of Red and Blue. And if the rumors are right, Red left civilization for Mount Silver right after the post-game. So that means he was on Mount Silver for 3 years with only his Pokemon. When Gold battled Red, he could possibly still be able to talk, but didn't want to. But Red isn't seen again until 8-10 years later, in the world tournament in Black 2 and White 2. Red definetly was on the mountain alone for enough time to lose the ability to talk, as when he came down to go to Unova, he was up there for 12-14 years alone with his Pokemon, only training them in the pure cold. So Red probably couldn't talk anymore after that. Most likely true.
Battle Legend Edit
It is possible that Red can speak, but doesn't want to. He seems like a really big legend every time a hear (or see) him say "...". Red might not speak to look very cool, but this probably isn't true.
He didn't ever talk, duh! Edit
If you really think about it, the few times Red had ever talked (not counting Pokemon Origins) he probably wasn't talking. The name choosing at the beginning was done some other way, the baseball thing was a thought, and the Copycat one was just Copycat pretending to be him. Red might be the quiet person who never wants to talk for a reason. The first theory is more likely than any theory I will come up with on this page, but this could be true.
(0.9 % Chance of being true) HE'S A PLAYER HE'S NOT SUPPOSED TO TALK Edit
If you think about it, players never talk! End of this (probably wrong) theory!