Final Fantasy Legend II Cheats (GameBoy)

This trick can enable you to get maxed out speed for every HUMAN OR MUTANT (M or F) member
of your group, if you do it right.  You have to play the game until you get to the "Mean,
Nasty Dungeon" and then enter that.  Keep going through the dungeon until you find a
chest that has a Speed Potion in it. Now use it on some one and then go to the trashcan
at the bottom of the items screen. Select it and then go to one of your characters and
use it on them.  It will give them a two-point speed increase, and you can do it over and
over again.  However, the number of times you can use it does depend on the number of
saves you have, so save it again and again until you have 99 saves before you use this
trick.

This cheat is something I found by pure chance and have never seen printed elsewhere:
  First off, you must have either a Mutant M or a Mutant F in your party.  When you are
in the world with the Dragon Race, enter the dragon race (you can pick any dragon you
want, but I prefer the slowest one; it's free.) .  You will meet with 1 to 4 bosses,
depending on which dragon you choose.  The last boss is called a Watcher.  SAVE
IMMEDIATELY before you fight it.  Fight the Watcher until your Mutant receives the skill
Teleport (This can take multiple resets to accomplish, but don't give up!!)  Teleport
anywhere, it doesn't matter, just make sure you're riding the dragon while you do it!! 
You will end up at your destination riding your dragon (It might not LOOK like a dragon;
as a matter of fact it can sometimes look really glitchy, but it won't affect your game. 
Don't worry.).  Now walk around.  Bingo!!  Ever wanted to cruise on those damn mountains? 
Now you can!  Have fun!!

On the Title screen, simultaneously press Select, B and Start. Change the number by
pressing Left/Right, and listen by pressing the A button.