Once you unlock Sonic you can obtain the Amy Rose trophy from either the Coin Launcher or the Subspace Emissary.
You can't get Amy as a playable character, though you can get a trophy of her at random through the Subspace Emissary or Coin Launcher.
Yes you can. You can find the mew trophy in coin launcher you can get it in super smash bros brawl and super smash bros melee but mostly super smash bros brawl.
mewtwo is not in super smash bros. brawl however mew is a trophy character
No.
Swimming Trophy? There is no such thing.
No but he is an assist trophy.
No
While Louie is not a playable character in Super Smash Bros. Brawl, he does appear in the game as a collectible trophy.
Blaze is not a playable character in Super Smash Bros. Brawl, just a trophy.
Shadow is onlyAccessibleas a Smash Trophy.
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Only as an Assist Trophy.
MISSINGNO in early Pokémon games was a bug, and so is very unlikely referenced in a Super Smash Bros. trophy.