1005pker

Well there is some. But I rekon not to. Here is how you can unlock some stages... :stage Unlock: Battlefield Stage To unlock the Battlefield stage, complete the All-Star 1-P mode for the first time. Stage Unlock: Big Blue Stage To unlock the Big Blue stage, you must play at least 150 matches in VS. Mode (without quitting). Stage Unlock: Brinstar Depths Stage To unlock the Brinstar Depths stage, you must play at least 50 matches in VS. Mode. Stage Unlock: Dream Land Past Stage To unlock the Dream Land stage of the past, beat Target Test with all characters, regular and hidden. Stage Unlock: Final Destination Stage To unlock the Final Destination stage, you must complete all 51 Event Matches. Stage Unlock: Flat Zone Stage To unlock the Flat Zone stage, you must complete 1-P Classic mode at any difficulty/stock with Mr. Game & Watch. Stage Unlock: Fourside Stage To unlock the Fourside stage, you must play at least 100 matches in VS. Mode (without quitting). Stage Unlock: Mushroom Kingdom II Stage To unlock the Mushroom Kingdom II stage, which is from Super Mario Bros. 2 on the NES, simply collect a Birdo trophy. The trophy is random, but when you find/win it, you get this stage. Stage Unlock: Kongo Jungle Stage To unlock the Kongo Jungle from the N64 version of this game, complete the 15-Minute Melee. I'd recommend using Donkey Kong and constantly use his Down + B move the entire time (thanks to DEngel's Secrets guide, for I used that strategy to unlock this)
Stage Unlock: Poké Floats Stage To unlock the Poké Floats stage, you must play at least 200 matches in VS. Mode (without quitting).

maniacman1234567

There are none that I know of. Just play through the game and look up ways to beat it and unlock everything. But I believe that there are some on action-replay and game-shark.