Basically, If I have a Finnish scatterbug and evolve it in germany, what pattern Will it become? In X/Y
"In Generations VI and VII, Vivillon's wing pattern depends on the real-world geographic location set on the game the Pokémon was generated in."
Your Scatterbug should become the Icy Snow form instead of the Continental form.
Sorry if answer is incorrectly formatted.
Source: Bulbapedia
Pokeball Pattern because currently pokeball is the base pattern. Patterns will change if you send the game letters from different places in Pokemon go.