Went back to some good old Dragon Warrior 3 on the GBC. I discovered a VERY cheap way to kill Metabbles. Basically, the idea is to have either the Hero or a Warrior wear the Blade Armor. If you have it available, cast Sap on the Blade Armor wearer so his/her defense drops to 0. If the Metabble hits him/her, it will damage in the 20s, but half of that is bounced back, killing it instantly. Really dirty, but meh. Who would have thought a debuff would be a game breaker against Metabbles to give yourself 40k EXP just like that? I was playing on an old solo Hero file and I used the Orochi Sword on myself (casts Defense which just halves the current DEF stat). Still just barely enough they kill themselves. My record was killing four of the metal cowards. HELLO over 160,000 EXP to my Hero!
The thing is, that's much more reliable than BeDragon, since at least for me, it seems they always run before the Mage/Sage gets his/her second turn to nuke them. Falcon Sword is iffy but gives two hits per turn while the Poison Needle is a guaranteed 1 damage with a small chance of instantly killing any non-boss enemy. So yeah, using Sap on a Blade Armor wearer is probably the most reliable way to kill Metabbles or in the case of a solitary Hero that's just about as headstrong and reckless as his father Ortega, having him use the Orochi Sword on himself produces positive results. I'm surprised that nobody thought of deliberately debuffing a character and abusing the damage reflection properties of the Blade Armor.
On another note, I feel inclined to do a Cleric -> Sage solo. The Cleric can get Healmore at level 14, which makes the Pyramid to Orochi easier than the Hero defensively. The only problem is the Cleric's mediocre attack power and can't make use of whips and boomerangs to help him/her out. As a Sage, physical attacks are much stronger, making the Sage pretty much the Hero without all the overpowered equipment but much better magic. Some fights would be much easier thanks to TwinHits, Upper, SpeedUp, earlier HealAll, access to both Sleep and Stopspell and every offensive spell in the game save for Zap and Thordain. Should be interesting getting to level 20 though with those restrictions. Debating about the Cleric's gender, since the Sexy personality is the best overall and is female only. Still, every solo Hero run I have done I used a male hero with the Solitary personality and didn't have too much trouble. Hmm...