maybe you mean star COINS, but you need to buy them :(
Kill the moga
tell you friends to send you a star seed
kill mogas for them(rare)
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monster galaxy delete
Give 9999 star bits to the banktoad. Melty Monster Galaxy's 'A Stroll Down Rolling Lane' is good for getting lots of star bits.
Check
Where to catch a mars in monster galaxy
To defeat the Melty Monster in Super Mario Galaxy, you need to navigate through a series of platforms while avoiding lava and hazards. Use the Spin move to break the crystal blocks and reveal Star Chips. Collect all five Star Chips to create a launch star, which will take you to the boss. Once there, jump on the Melty Monster's head when it’s vulnerable to defeat it.
Monster Galaxy has yet to release that
You can find monster galaxy in Myspace or Twitter
monster galaxy account can be deleted. but your datas in the said application cannot be deleted..