Hmm, that's a good question. Ironically, I use FlipaClip as well, but i have heard Ibis Paint X is good, but I don't know if that's an animating tool. Also, if you have a tablet, then Krita would be a good choice too. Either way, I hope you have luck on this project of yours!
Vexxuco
Ibis paint? I mean, it's a good app that in addition to drawing serves to animate, the only problem is that you can't add audio.
thatoneartist23
Thanks dude :)