Imo using Acrobatics with a Flying Gem is a much better option that Pecha Berry and Natural Gift. At +2 and with an Adamant nature, you still OHKO Jellicent, Tentacruel, defensive Politoed, 252 HP Vaporeon, and offensive Gyarados after SR. The only poke that you miss on hitting is Skarmory, which is already hit for 50% of his health by Superpower, and has to gamble between using Roost and Whirlwind. If he uses Roost as you use SD, then he is fucked, and if he uses WW as you use Superpower, he just lost 50% of his health, while Scizor lost nothing.
Pecha Berry Natural Gift is nice and all, but let's not forget that we are talking for a one time only attack. After you use it, then you are left with a shitty normal typed attack (does this move even have BP without a Berry?) that provides nothing. In the other hand Acrobatics is still useful, even after the Flying Gem is consumed, and is for all intents and purposes a 75 BP Bug attack. Oh and with Acrobatics you can also any Conkeldurr regardless if you are boosted or not.
tl;dr Flying Gem Acrobatics completely outclasses Pecha Berry Natural Gift.
Part of the OU QC team, message
me for a check!