The Blue Whale the biggest and the king of the ocean.

No they still need the oxygen we breath but they can't because the ice block's it out.

They died millions of years ago because they couldn't find food.

Yes the same as the coat.

It is one of the big cat's.

You can't get mewthree because it isn't a real pokemon.

A old women in larviridge town gives you a egg when you talk to her.

It won't do anything except you can catch wild pokemon there.

All over the world in the oceans and salt water you will find most of them around the coral.

Go further into the game then look for wild pokemon lower there health and use a timer ball.