Nothing, really. Get 150, then you get the National Dex, I think.
it stops growing levels. therefore it is the highest it will get
100
Nothing
to get the ruby yes you do
nothing
There is no awakening cave.
i guess nothing
nothing happens.
i think it is moltres or charizard both have to be level 100
Use the Vs Seeker, which is found in Vermilion City in the Pokemon center
Yes you can trade leafgreen version Pokemon to another leafgreen version.
no no no might be