Well, here is some pointers. Save your flower points (FP's) because once Crocko is down to a certian HP point, he'll steal all of your items. Once he does that, use Mallows Rain dance, rain shower, something like that, to replenish your HP. If Mallow faints, your history. Use Mario and Geno to use the regualar attacks on Crocko. If your HP levels are at a good point to where you won't faint, then have Mallow attack (but he's very weak) Eventually you will be able to defeat Crocko. He will leave giving you a bomb and all of your items back. Plus that will be the last time you will be able to fight Crocko.
You can get SMRPG at several Buy, Sell, and Trade gaming stores. Also, try out the game when you find it. If it's really glitchy, don't buy it even though you can sell it. Find a good one. Heck, I found a LOZ:Link to the Past game at one of those stores. I still can't beat the first boss when you go to the dark world. I've come close though. Anyways, I hope that is helpful for you.
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The Game Master.