Sigh......I think I have rotten luck......and I know this is not a save file issue either. As it didn't start doing this until after I beat team rocket on five island. I went back to Vermilion, then headed off to Cerulean and went into the cerulean cave and the roof, bridges, and wild Pokemon looked pixelated.....reloaded the game, now EVERYTHING is pixelated, the start screen, graphics, pc box, absolutely everything. Put my save file on my desktop then deleted and redownloaded the game and it's still doing it on the game menu and I haven't even put my save data back yet. I think I have bad luck, sorry for this.......
Edit: Who dares pull an April Fool like this?! I thought my game was done for, scared me shitless! QAQ Well, at least the reinstall helped other problems resolve a bit. Also the timing of the April Fool's prank was perfect due to my recent crash bugs and problems worrying me just recently. ^^; But now that I know April Fools pranks exist in this game, I shall be more aware. XD However the colored pixel graphics made it much harder to navigate so I had to temporarily change the date on the computer. ^^; Wish the prank would've involved changing general color instead, instead of a pixelated mess, such as yellow water, pink mountains, blue grass, red buildings, funny colored people and Pokemon, etc. Just a thought. XD