1) How about the dev's add some kind of 'food' that can level up our moga. just like rare candy in pokemon games. but this kind of food, we have to get it from wild moga. we can't buy it. the chance for getting this food will be around 4-6%.
2) my other suggestion is, the dev's add some 'food' that can cure poison, confuse and other things that can weaken our moga.
i don't know if u guys agree or not. this is just my suggestion