They are both in the Flying group, so that is not the problem. Are you sure it isn't just taking a long time and you are losing your patience?? What does the Day Care man say when you speak to him?? Pick one:
- "The two seem to get along very well."
- "The two seem to get along."
- "The two don't seem to like each other."
- "The two prefer to play with other Pokémon than each other." (<--although he should not say this)