Lets say my opponent sets up Spikes and I send in a Flying-Type/Pokemon with Levitate. Then lets say my opponent sends in a Gravity user and uses Gravity. My question is will the Spikes hurt my Pokemon if it is already on the field and Gravity is used?
Spikes are "Entry" Hazards therefore I'm going to have to say no. I have not tested myself but I did use a Gravity Team in Gen IV and I do not remember that ever happening. Spikes and SR only take effect during a PKMN entry.
