Hey
@dmode15!
I've found that playing a 1 Ralts, 1 Rare Candy, 1 Gardevoir GX line can help against Oranguru as Gardevoir GX just needs three Fairy energy and one energy on the Oranguru to K.O. it (or 1 Fairy and 1 DCE). Gardevoir GX can also help in other matchups by providing a way to wall with 230 HP, be offensive (as mentioned above), or recycle resources with Twighlight GX. It is probably a little better than Prof. Kukui as it can be useful in other matchups (since Prof. Kukui is a little situational), but if you can't find room to fit in the three card combo of Gardevoir GX, than the one Prof. Kukui can also be used.
Hope this helps!
~FrostBiter12