Warp to Elcid once you get your ship. Walk to the east end of the island. You will see another island. Sail to that island and walk around. Every monster on the island drops ak ind of fruit. Note: This includes Black and White dragons, don't fight them until you're at least level 45. Also, the dragons are the best source of experience when at level 45 and above.
If you don't have enough money to pay the Inn's price they'll let you in for free.
You can easily raise your Capsule Monsters with this great trick. Feed the Capsule Monster you wish to train a Long Knife available from any store, then soft reset your game using the L+R+Start+Select buttons. Load you game again, and you'll find that you can still use Long Knives to continue raising your monster, so you don't require a higher level item to increase their experience like normal! Simply feed them a Long Knife again, then soft reset and repeat as necessary.
Note however that you must choose to soft reset in order to take advantage of this glitch, hard resetting (using the Reset button on the console) will not work.
Succesfully complete the game and allow the credits to end. Eventually, information about how well you did during the game will appear. Pretty interesting stuff.
Complete the game once, then select the "retry" option. Gold and experience in this new game will accumulate at four times the standard rate during battles. Successfully complete the game in "retry" mode to unlock the "Gift" option.
Go to the configuartion option in the menu. Scroll donw to the music option. Do not press Right or the code will not work. Press left, then press Left, Up, right, Down, Right, Up B. Open your menu screen and then your level should be 0. Save at a church. Power off your SNES. Startt again and load the saved game. Go to a inn and sleep. Your HP & MP should be around 999, and if you check your status all stats should be at 999.