That would be either the color or the body type for each Pokémon on a team, but they don't all have to be either the same color or the same body type, right? If that's the case, I might as well make one of each and then pick a favorite from that:
Red Jaguars: Darmanitan (two for one!), Jynx, Mamoswine, Houndoom, Scizor, Druddigon
Blue Barracudas: Garchomp, Eelektross (two for one!), Toxicroak, Dewgong (two for one!), Nidoqueen, Heracross
Green Monkeys: Garchomp, Bronzong, Tropius, Vigoroth, Gengar, Nidoqueen
Orange Iguanas: Mamoswine, Galvantula, Shiftry, Infernape, Drapion, Alakazam
Purple Parrots: Venomoth, Cloyster, Espeon, Arbok, Crobat, Archeops
Silver Snakes: Steelix (two for one!), Arbok, Machamp, Gyarados, Dragonair, Stoutland
...Huh, even then I'd pick the Barracudas team first.

The Parrots or Monkeys team would probably be second.