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Assuming you're not trading until endgame, and you want to give yourself somewhat of a challenge without using complete shitmons, Pick 6 from this:
>Chespin
>Eevee (Espeon, Flareon, Sylveon, or Vaporeon)
>Absol
>Bidoof
>Binacle
>Doduo
>Drifloon
>Emolga
>Fletchling
>Furfrou
>Hariyama
>Haunter (no trade)
>Kangaskhan
>Lapras
>Machop
>Meditite
>Miltank
>Oddish (Vileplume)
>Pancham
>Pansear
>Pikachu
>Sandile
>Scraggy
>Seviper
>Skiddo
>Snorlax
>Solosis
>Tauros
>Tentacool
>Trapinch
>Venipede
>Zubat