I want to transfer some pokemon from yellow to omega ruby. I'm talking about the 3DS version?

No, it's just too many generations apart. You would need to have the physical version of each game, and you'd need a Gameboy color, gameboy advance, ds and 3ds. It would be cheaper to just get pokemon bank, but that won't work because yellow isn't an actual 3ds game, the 3ds is emulating a gameboy color. So sorry, you can't.