After I remembered reading it somewhere, I tested burying spheres of the same type on top of each other (same spot) and the result was interesting.
Let's say you have multiple red spheres, sizes 5, 10, and 30 (the following are not exact figures): if you buried the size 5 and then put the size 10 or 30 on it, it would grow a bit, most likely becoming 7-9 in size. Now, if you buried the size 10 and added the 5 or 30, it would be about 12 or so. If you buried the 30 and added the 5 or the 10, it would become 33 or so.
What this means: if you burry the largest sphere first and add multiple smaller spheres onto it, it could reach a very large size. Also, don't add two big spheres together; the result will only be slightly higher than the first sphere buried.
That's as simple of an answer as I can give, I hope it helps.
Oh cool thanks for that, yeah it did help, I have another question though, this one doesn't relate too much to the previous question though and that is, when does the "ballon" pokemon come to the Windmill place, what day I mean, of course I know the ballon pokemon is drifloom or whatever, and I only have like, 2 badges so my only real form of a pokeball is well...a pokeball, do you think I would be able to catch it on the certain day anyway?