Why can't my male Ralts breed with a female Litwick? (Pokemon X)?

Question

Ralts and Litwick are both in the Amorphous egg group....?

Answer 1

Indeed it can. You just have to try longer.

If the NPC say:

>"The two don't really seem to like each other very much."
Man: "But I have to say, those two don’t seem to like each other all that much." / Lad: "But they don’t seem to like each other very much..."

then, there is a 20% chance that an egg will be produced every 256 steps.

This is, assuming that they both belong to you. Here's how Original Trainers and Species of a Pokemon matter in breeding:

Credits: Bulbapedia

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As long as he doesn't say:
>"The two prefer to play with other Pokémon more than with each other.",

you will definitely get your egg. Just be patient. Some eggs take longer than others.

Answer 2

The only fault I can only see in this is 1) you either both owned them together and 2) If you did however, catch both of them with-in your game, there is a 20% chance of them breeding if put in the Day-Care. So maybe they're in the same group, however, they don't seem to like each other much (20% change, this is what the Breeder says), or you got your groups mixed up.

Hope I helped!