you can only use Pokémon that are the same color as the flag of the country you live in

[Sheep]

https://bulbapedia.bulbagarden.net/wiki/List_of_Pokémon_by_color

which do you pick
(if the country has an even distribution of colors, you can either 1) pick one color, or 2) make a team of various colors as represented by the flag)
otherwise if your flag is mostly one color, use that

 

[Soaring Sid]

This is such a creative thread! The colours may not exactly match with those of Bulbapedia's.(Why's butterfree in white)

Here's the tricolor:

Spoiler:

I'd love to make a team of various colours. I can make a team that has the following colours: White, Orange, Blue, Green. This team might not be good from a competitive standpoint , though.
1: Abomasnow - white
2: Garchomp - blue
3: Sceptile - green
4: Talonflame - Orange
5: Greninja - blue
6: Absol - white

 

[Noblejanobii]

So since I'm from the states, I can use Red, White, and Blue for my colors. The team I'd pick from it would be:
1) Froslass
2) Togekiss
3) Krookodile
4) Samurott
5) Salamence
6) Braviary

 

[Brendino]

I've only got red and white to pick from for Canada, and to be fair, I'll use the proportions of the flag to make up my team (2/3 red, 1/3 white), otherwise my team would probably be 5 white and 1 red lol

Red
Rotom-W
Incineroar
Scizor
Porygon-Z

White
Froslass
Gardevoir

 

[Blue_Pigeon]

As I'm from the UK, I've got Blue, Red and White to use - divided into 3 pairs of pokemon.

Blue
Hydreigon
Greninja

Red
Porygon Z
Darmanitan

White
Froslass
Togekiss