So if I Mega Evolve Scizor will it still eat the berry? Will the Berry be immediately eaten without waiting? For example, I use Bug Bite against a Serperior with an Aguav Berry and my HP isn't down to 1/4 yet, will I still eat it?
Bug Bite will immediately consume the opponent's berry.
Bug Bite deals damage, and if the target is holding a Berry, the user eats it and gains its effect. For example, if the target is holding a Sitrus Berry the user will recover 1⁄4 of its HP.
Replay Source
Yea, its happened to me before with +attack berries commented 41 seconds ago by ☆SleepyDreepy☆
Me. I've done it with my scizor at battle tree, and I get an attack boost. Source:experience