PROS
- skip mega punch (20s)
- metal claw bridge caterpie/weedle (1s each)

CONS
- rival 2 squirtle (second hit sometimes)
- rival 2 abra (usually only relevant if no blaze)
- can't elixer skip
- rival 2 wartortle (second hit rarely)
- rival 2 kadabra (only if no blaze)
- misty (depends on attack and slave, because sometimes can finish with cut)
- rock tunnel slowpokes
- rock tunnel machop (only a pp problem, as ember is always more likely to kill)

ASSUMING ~28 IV ATTACK AND PIDGEY:
-20
-2
+2
+1
+1
+0
+1
+2
+6
TOTAL: 9 seconds saved

If Rattata, probably get MP
If bad Attack, close call