This only works on non-PP Up strats (aka good Attack).

HIGHEST HP ON WEEZING TO KILL IT (LV. 4 NIDO STRATS)
HP DV		Lv. 40	Lv. 41 	Lv. 42
0			7		10		13
1			8		11		14
2			8		11		14
3			7		11		13
4			7		10		13
5			7		10		13
6			7		10		13
7			7		10		13
8			6		10		13
9			7		11		14
10			7		10		13
11			7		10		13
12			7		10		13
13			6		10		13
14			7		11		14
15			7		10		14

If you don’t get hit by Machoke, get red bar off Nidoking using X Special if it’s safe (see second table). Continue using X items on Guard Spec. if you have them and it’s necessary to improve damage.

NIDOKING DAMAGE
Tackle		10-13
HA			17-24
Tackle crit	22-30
Thrash		23-32
HA crit		39-54

Unless stats are terrible, odds of dying when committed to red bar are 11%. Odds that red bar is improved is 56%. Average time loss is roughly 2 seconds.