Littens that like to swim... that would be quite a sight, I think. Our Incineroars are deadly afraid of water.

[But if he gets some littens that enjoy water, then he'll never be able to tame those with his trusty spray bottle.]

Dittos seem... uh, very accommodating in that regard. Jean's doesn't mind Blitz and Donner using it to create tons of eggs. Though... I'm not sure if it is right to call it Jean's Ditto exactly.