So I am playing Pokemon Y and I want a Life Orb really badly. I know that you can get Life Orbs from Absol in ORAS, but can you find them in Pokemon Y?
No, sorry. You can only find Life Orbs in Kalos by purchasing them from the Battle Mansion, at 48 BP each. If you're able to trade with yourself and you have a copy of ORAS, you can try to find an Absol with Life Orb and trade the Life Orb you get from it over to Y.
Life Orb (Bulbapedia)
Hope I helped!