They should make a Tier where you can only use all Pokemon of a certain colour group:
Some notable Pokemon in each colour group:
Red: Charizard, Scizor, Latias, Rotom, Bisharp, Talonflame
Blue: Gyarados, Azumarill, Altaria, Heracross, Metagross, Latios, Garchomp, Thundurus
Yellow: Beedrill, Zapdos, Moltres, Shuckle, Raikou, Manectric, Jirachi, Victini, Keldeo
Green: Venusaur, Tyranitar, Sceptile, Breloom, Chesnaught, Hawlucha, Zygarde
Black: Umbreon, Vivillon, Chandelure, Dusknoir, Honchkrow, Weavile, Houndoom, Snorlax
Brown: Pidgeot, Alakazam, Pinsir, Dragonite, Lopunny, Mamoswine, Heatran, Landorus, Mandibuzz
Purple: Cloyster, Gengar, Crobat, Starmie, Ditto, Aerodactyl, Sableye, Gliscor, Hoopa, Gothitelle
Gray: Machamp, Skarmory, Aggron, Magnezone, Rhyperior, Excadrill, Ferrothorn, Terrakion, Klefki
White: Smeargle, Gardevoir, Absol, Togekiss, Gallade, Amoongus, Volcarona, Florges
Pink: Clefable, Slowbro, Chansey, Alomomola, Sylveon, Diancie
How do you guys think it would play out? Which colour, in your oppinion, would be best or worse?