Although I’m not against Liko getting a Dragonite, I would still be disappointed if we end up with the same Pokémon.
That’s why, if Liko is to benefit from a Dragon-type Pokémon, I would opt for either Salamence or Drampa.
As for the former, there could be a whole story surrounding his desire to fly and Liko would do everything in its power to fulfill his Pokémon’s greatest wish.
For the second, all his pokédex entries speak because he has a special connection with children and if something happens to a child he loves, he becomes uncontrollable. So I think he would also be a good candidate to join the Liko team.
In addition, these two dragons have a color palette that fits well with the girl and could be aerial supports for Kilowattrel.