Question

Also, what is the Base Power with a Flying Gem?

Answer 1

Acrobatics
- Without an item: Doubles from base power, so 110
- With Flying Gem: 165

If the user is holding a Flying Gem, the item is consumed before this move checks whether the Pokémon has an item or not; therefore, the power is tripled -Bulbepedia

Hope This Helped :D

Answer 2

BP of Acrobatics with an item = 55.
It doubles when not holding an item, to 110.
And Flying gem gives a 1.5* boost, so you're looking at 165 with a Flying gem, and 110 without a Flying gem, or any item.

Answer 3

1. 110
2. 165