Nob fight			+13.5
30 for Oddish		+1.2 (depends on stats)
25 for Oddish		-0.8 (depends greatly on Attack)
Candy menu			-0.5
Bubblebeam PP		-0.7
28 for Pidgeotto	-0.5
28 for Raticate		-0.7
28 for Kadabra		-1.4 (depends on stats; added -0.2 for 29 for Voltorb option with good Speed)
28 for Ivysaur		-1.0
29 for Raichu		-0.3
29 for Oddish		-0.4 (depends on stats)
29 for Oddish		-0.4 (depends on stats)
30 for Venonat		-3.1 (depends on stats)
30 for Slowpoke		-2.7 (depends on stats)
30 for Slowpoke		-1.6 (depends on stats)
More money			-0.2

So, always fight Nob if one of the following is true:
- You have 5-10 DV Attack
- Rattata QA kills

Otherwise, don't fight Nob with great Attack and Speed, but consider him in other situations.