I happen to use Script Kiddie for Hackster.

There are many monsters that i use a G1 skill. Especially if G2 and G3 have no compelling 0 cool down skills.
Let's take Thetys for example. I swear by Cought!. Easy choice.
Cavenfish's "Lead Rain" simply a must.
And so on so forth. It all depends in what capacity you wish to play the monster.

@Clackers said in Do you use any skills from Skill Set 1 on your monsters?:

I happen to use Script Kiddie for Hackster.

I was going to say Shutdown for VapWhirl and Sea Lion and Mass Haste for Haze, but those are all skill group 2.
:)

Keep in mind that Just because a skill is in the group 1, doesn't mean the skill is bad and it shoudn't be chosen. There is a lot of good skill that is in the group 1 like Vanitus's Egg Boost(i think this is the name), Zyla's 0 CD Extra Turn skill and some 0 CD AOEs that is actually very powerful. You have to take into consideration every skill and then analyse the utility of the attacks in the battles, and only then you choose the attacks you want, so if you take into consiseration only group 2 and 3 skills, you will be very sorry because you forgot to analyse a very good skill that is in the group 1, and with that your monster will be useful in only a very few situations.

@Clackers I use ego boost on my vanitus and it's pretty good.

Cavenfish' Lead Rain
Mommy's : Don't lie to mommy
Eggeater's: Snake Chomp.
Layth's: Ad Leones

Master Skeel: Overrun
Thetys: 'Caught' when the war calls for it
Timerion: 'Stunning Tempo' and 'Precision Tempo' when the situation calls for it.

Fampira's Give Me Your Life since they nerfed Look at My Eyes to be even weaker.