Mmkay /vp/ advice please?

inb4 corny

My club is organizing a kind of ''league' within of itself with some senior members acting as leaders for an event. The winner (champion) gets prize money and an egg of a pokemon from a gym leader's team of their choice. I was chosen to represent the dragon type lol.

Here's my team so far:
-Dragonite (Gawain), Lvl 78
-Gabite (Percival), lvl37
-Axew (Lancelot), lvl29
-Tyrunt (Galahad), Lvl32
-Goomy (Bedivere), Lvl 37

I'm obviously gonna train them so that their levels even out a bit more, but I need an idea for the last one. No legendary.
There's just a handful of them, but that makes the decision harder. Assistance please?