Easy Zennies:
With this trick making zennies can be very easy. Just go to the Apple Market and look for a small yellow can near the entrance. Kick the can over teh counter and the shopkeeper will give you a good 1,000 Zennies for picking up litter. Leave the store and go back in and the can will reappear and you can do the trick again. Repeat as much as you want.

Easy Win
As soon as you fix the flutter, go to Barrel's room and get the kit that gives you grand grenades. Next, collect lots of zenny and enhance it's attack. When you get to the boss of the subgate in the clozer woods, let the bosses come forward a little so they are in range. When they are, constantly pound them with the grand grenade and you should beat them easily.