I dislike like ALMOST ALL utility moves... there are only a few I really use... but that may just be because I only play 'ingame' and not competetively (and that only against friends for fun and not competetition...)
Why is that... well...
10. Ally Switch
... just... what? ok... I get it it's to be able to protect your ally in a double battle... but it doesn't have any priority so if the enemy is faster this move just deosn't matter, because you switch sides after your ally is hit... which results in a wasted turn...
9. Ancient Power
I know it's an attacking move... but it may also buff EVERY stat of your Pokemon... and that's it! Enemy uses Ancient Power - Stat rises EVERYTIME! I use Ancient Power... it either misses completely or I just don't get the buffs... EVER! (really! I NEVER got the buff from that move over all those years!)
8. Protect
Wild Pokemon with protect are just annoying... "Protect fails on consecutive uses"... yeah... tell that all these Spewpas in Rejuvination! 3 consecutive uses of Protect... still activates... just a waste of PP of attacking moves...
7. Fairy Lock
HEY! let's give Klefki a signature move... that's a crappier, one-turn only, version of Mean Look...
6. Attract / Captivate
Moves that only work on opposite gender of the user... and misses on gender-less or same gender... yeah... I am fully in control against what gender I fight...
Attract is worse because of it's 50% chance of not attacking... In my case it's more like 90% when my Pokemon was hit...
5. Mud Sport / Water Sport
as a ground Pokemon... you are IMMUNE against electric attacks... why do you have the need to lower electric moves power?
the ONLY non ground-type (or becoming ground-type) that learns it naturally is Krabby!
as for Watersport... only Water-Pokemon learn it and they have a natural resistence against Fire... sure it's no immunity and Water/Ice and Water/Grass types profite more from it... but really???
4. Magnetic Flux
A Utility move that only works on Pokemon with certain Abilities: Plus and Minus... 2 of 4 Pokemon that can learn this, don't even have the Ability available (Electrode and Magnezone)
From the other two only Klingklang has one of these abilities naturaly and Ampharos only gets Plus as a Hidden ability... sooooo pretty much useless unless you have an electric mono double-battle team specializing in Plus and Minus... which will most likely never happen because the only ones that get theese abilities are Ampharos-line, Klingklang-line, Plusle, Minun, Dedenne and Manectric-line
3. Sand attack (and similar)
I am cursed with this... Enemy uses sand attack, and for the next three turns my Pokemon just doesn't hit (except always hit moves like Swift)
If I use that kind of attack... it just doesn't bother the enemy... he just keeps hitting and hitting and hitting...
2. Heal Pulse
Why would you give your enemy 50% of their HP back???
a double battle move that may or may not work in your favor...
1. Swagger
Just... it's just TOO double edged... I use it... enemy snaps out of confusion immediatley and OHKO's me... I get hit by it and Confusion last forever and I hit myself until I'm dead or switch out and in this time the enemy buffs him up even more...