i havent seen any good ones for the stuff i think your thinking about (like my sig) but i used adobe image ready to make the on in my sig which i got with adobe photoshop which the latest is about $600
The easiest to use, free to animations?
There is 1 product on the internet that can do that but it lacks many features that are in your head right now.
Still, if you are desperate for one, try Unfreez then. Although I doubt it would be useful, but still can be used for simple animations.
Jasc Animation Shop-- Its one of the best I've used, but its a trial of 30 days and then 60 days.
Makmha (or something like that)-- No. Worst. Its horrible.
Microsoft GIF Animator-- The one I'm using right now, It might be hard to understand, took me 3 months. And I'm only limited to small animations here, because I don't know how to use the ENTIRE program. I'm not such a fast learner. But its worth learning.
Adobe ImageReady. Has the power of photoshop and you can make animations. You can specify how many sec the frame will show before it goes onto the next one. Imageready only comes with photoshop, but Photoshop Elements should have the ability to make animations too.
do you possibly want to take off the other pokemon before the one appearing?, im not sure about the programme your using, as ive never used it, but see if it has a layers sytem, if so , for each frame only let the layer of the new pokemon show, taking away the last one, and any before that.
my one has about 10 layers, as its small, but has like 40 frames, which isnt that much considering that a tv shows about 50 frames per second...