(Some other small questions:
What bytes do i have to change if I want the regional pokédex in fire red contain pokémon 1-252?
Nothing more at the moment :) )
For the move tutor thing, you can change a Pokemon's move pool through YAPE (also in the toolbox).
For the National dex problem, I have no idea how you would limit it to being only the first 1-252 :D
What's wrong with just enabling the whole thing?