if you want Super Mario-Series SFX, try googling Mario Fan Games Galaxy.
it has lotsa SFX, some music, & much other stuffs you can use to make Mario flashes, games, etc.
no Pichu is not in brawl they got rid of all the double characters of melee like Dr. Mario and young link, except for toon link. he's a new character.
No, it's only on Nintendo systems, the original SSB is on Nintendo 64, Melee on GameCube, Brawl on Wii.
Yes, you can get Mario Brothers Smash Melee and other Mario games for the GameCube.
Complete classic mode with Mario
you can't. but you can in melee.
No, theres only Mario.
you cant
We should download a emulator (Dolphin Emulator).
Only if you hack it
yes
Mario and others
You can. All you need is a Gamecube Emulator. Then download a Super smash Bros. Melee ROM. In the emulator, go to open ROM and select the melee file. It should play once you modify the controls to the buttons on your keyboard.