Just try hard, You can do it!
There is none.
Can't
you already have him
You don't, he is there automatically
Acually, he is not in jingle brawl. He is in super brawl. No codes are used. You just have to beat him! Good luck!
anybody can
All you need to do is K.O. Dr. Blowhole twice in a match. I found a guide to it that appears very effective. http://www.youtube.com/watch?v=synRlsmVaDw
on super brawl summer defeat Patrick on tournament mode to unlock Patrick and the goo lagoon
mario
Anyone if you try hard enough
beat sheik and ness
A game mode option in super smash brother brawl (the video game) that pins you (the player) against brawl specific alloy fighters that show you no mercy for pounding you relentless. (Defeat 10 to unlock the snake sticker).