I was going to suggest Musharna because I thought it could learn Thunder, but apparently it doesn't :/. Actually nothing gets Thunder and Telepathy (well except Dialga, Palkia and Giratina lol).
Still, why not just use Beheeyem anyway? There's no rule saying that you HAVE to use Thunder as your rain team's electric move, and Thunderbolt is still one of the best moves in the game. Plus, Thunderbolt still has 100 accuracy should your rain disappear (Thunderbolt won't do much to Tyranitar, Hippowdon or Abomasnow but it might help out with the back-ups).